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The soot produced in the process of coal pyrolysis seriously affect the atmosphere environment and health of human beings. This study used naphthalene-the most abundant precursor species in coal tar-was used as a raw material to conduct pyrolysis experiments in a self-designed drop tube furnace, combined with density functional theory, to explore the influence mechanism of Na in the formation of coal-derived soot. The microstructure and functional group information of soot derived from the pyrolysis of naphthalene are obtained through transmission electron microscopy, infrared spectroscopy, Raman spectroscopy and XPS analysis. The experimental result shows that Na can inhibit the aggregation of polycyclic aromatic hydrocarbons, resulting in a shorter average length of graphite-like crystallites in the soot particles, and promoting the oxidation of the soot surface. The simulation result shows that Na inhibits the polymerization of aromatic rings. These experiments and simulation results show that the ions formed by gaseous Na form a Na+-π structure with naphthalene, which increases the energy barrier of the reaction between naphthalene molecules and naphthalene radicals and inhibits the polymerization of aromatic rings.
Ziqi Zhao; Jianmin Gao; Qian Du; Dun Li; Heming Dong; Yu Zhang; Haibo Li. Effect of Na on the condensation reaction of naphthalene molecules during coal pyrolysis. Journal of the Energy Institute 2021, 98, 313 -321.
AMA StyleZiqi Zhao, Jianmin Gao, Qian Du, Dun Li, Heming Dong, Yu Zhang, Haibo Li. Effect of Na on the condensation reaction of naphthalene molecules during coal pyrolysis. Journal of the Energy Institute. 2021; 98 ():313-321.
Chicago/Turabian StyleZiqi Zhao; Jianmin Gao; Qian Du; Dun Li; Heming Dong; Yu Zhang; Haibo Li. 2021. "Effect of Na on the condensation reaction of naphthalene molecules during coal pyrolysis." Journal of the Energy Institute 98, no. : 313-321.
Reactive force field molecular dynamics (ReaxFF-MD) (reactive force field molecular dynamics) is a promising method for exploring complex chemical reactions, allowing a better understanding of sulfur transformation during coal pyrolysis. In this work, we built three pyrolysis systems with different H2O contents to explore the effect of H2O on the transformation of sulfur during demineralized pyrolysis by ReaxFF-MD. Product distributions, sulfur-containing bonds, and the path of organic sulfur in different systems were analyzed. We found that H2O could accelerate the pyrolysis process, reduce the semicoke yield, and increase the production of gas components significantly, including H2S gas. By adding H2O during pyrolysis, more sulfur in semicoke and heavy tar converted to gas and light tar, respectively. H2O not only promoted the cleavage of C–S bonds but also generated more H free radicals to form SH free radicals, thereby promoting the removal of organic sulfur.
Min Wang; Jianmin Gao; Junjie Xu; Qian Du; Yu Zhang. Effect of H2O on the Transformation of Sulfur during Demineralized Coal Pyrolysis: Molecular Dynamics Simulation Using ReaxFF. Energy & Fuels 2021, 35, 2379 -2390.
AMA StyleMin Wang, Jianmin Gao, Junjie Xu, Qian Du, Yu Zhang. Effect of H2O on the Transformation of Sulfur during Demineralized Coal Pyrolysis: Molecular Dynamics Simulation Using ReaxFF. Energy & Fuels. 2021; 35 (3):2379-2390.
Chicago/Turabian StyleMin Wang; Jianmin Gao; Junjie Xu; Qian Du; Yu Zhang. 2021. "Effect of H2O on the Transformation of Sulfur during Demineralized Coal Pyrolysis: Molecular Dynamics Simulation Using ReaxFF." Energy & Fuels 35, no. 3: 2379-2390.
Local flue gas recirculation (LFGR) is an effective technology for reducing nitrogen oxide (NOx) emissions from coal‐fired industrial boilers. The temperature and reaction atmosphere changes when flue gas is recycled, thereby affecting both the grate‐fired process and NOx emission. In this paper, the boundary of LFGR was simulated by changing the experimental parameters. On a small‐scale one‐dimensional fixed‐bed system, the effects of temperature, O2 flux, and CO, CO2, and recycled NO concentrations on oxidation‐reduction layering and char nitrogen conversion during the char grate‐fired process were studied. The effect of temperature and recycled flue gas components on nitric oxide (NO) emissions during the char grate‐fired process was then analyzed based on the mass proportion of oxygen‐absent and oxygen‐present parts. The results show that, with the introduction of recycled flue gas, increasing the temperature will also increase the reduction layer mass and proportion, and, subsequently, inhibit NO emissions; increasing the O2 flux will reduce the reduction layer proportion and subsequently promote NO emissions; increasing the CO and CO2 concentrations will reduce the NO emitted from the oxidation layer, yet has limited effects on the entire char bed; and recycled NO will significantly reduce the NO emissions. The effect of LFGR‐induced changes in temperature and reaction atmosphere on NO emissions can be ascribed to the negative effect of the increase in O2 flux and the positive effect of the increase in temperature and CO, CO2, and recycled NO concentrations.
Biying Yang; Jianmin Gao; Li Xu; Jie Xu; Qian Du; Fengan Zhang; Lei Chen; Guangbo Zhao; Shaohua Wu. Effect of temperature and reaction atmosphere on nitric oxide emission during a char grate‐fired process in local flue gas recirculation. The Canadian Journal of Chemical Engineering 2020, 1 .
AMA StyleBiying Yang, Jianmin Gao, Li Xu, Jie Xu, Qian Du, Fengan Zhang, Lei Chen, Guangbo Zhao, Shaohua Wu. Effect of temperature and reaction atmosphere on nitric oxide emission during a char grate‐fired process in local flue gas recirculation. The Canadian Journal of Chemical Engineering. 2020; ():1.
Chicago/Turabian StyleBiying Yang; Jianmin Gao; Li Xu; Jie Xu; Qian Du; Fengan Zhang; Lei Chen; Guangbo Zhao; Shaohua Wu. 2020. "Effect of temperature and reaction atmosphere on nitric oxide emission during a char grate‐fired process in local flue gas recirculation." The Canadian Journal of Chemical Engineering , no. : 1.
Utilization of the excess capacity from power plants by electrocatalytic methods to reduce the products from ammonia-based carbon capture technology to chemicals such as syngas is valuable and meaningful. Direct electrocatalytic reduction of NH4HCO3 electrolyte to syngas without CO2 bubbling is rarely reported. A porous Br-modified Ag catalyst with trace amounts of Br on the surface was investigated in 1.0, 2.0 M, and saturated NH4HCO3 electrolyte without CO2 bubbling. This catalyst can generate CO and H2 at ratios with ranges from 2:1 to 3:1. The highest CO Faradaic efficiency of 77.8% was observed with the CO current density of 13.8 mA·cm-2 at -0.6 V vs RHE in saturated NH4HCO3 electrolyte. By contrast, the Ag catalyst with high selectivity for electrochemical reduction of CO2 to CO cannot catalyze CO production under this condition. On the Br-modified Ag catalyst, the trace amounts of Br formed a chemical bond with Ag in the Helmholtz surface, leading to changes in the electronic state and structure of Ag. The results are beneficial to the adsorption of intermediates. Thus, the remaining Br may serve as active contributors to promote the selectivity and catalytic activity of the electrochemical reduction both on the Br-modified Ag catalyst and in the NH4HCO3 electrolyte.
Huiyi Li; Jianmin Gao; Qian Du; Jingjing Shan; Yu Zhang; Shaohua Wu; Zhijiang Wang. Direct CO2 electroreduction from NH4HCO3 electrolyte to syngas on bromine-modified Ag catalyst. Energy 2020, 216, 119250 .
AMA StyleHuiyi Li, Jianmin Gao, Qian Du, Jingjing Shan, Yu Zhang, Shaohua Wu, Zhijiang Wang. Direct CO2 electroreduction from NH4HCO3 electrolyte to syngas on bromine-modified Ag catalyst. Energy. 2020; 216 ():119250.
Chicago/Turabian StyleHuiyi Li; Jianmin Gao; Qian Du; Jingjing Shan; Yu Zhang; Shaohua Wu; Zhijiang Wang. 2020. "Direct CO2 electroreduction from NH4HCO3 electrolyte to syngas on bromine-modified Ag catalyst." Energy 216, no. : 119250.
In this work, two series of brown coals (including acid-washed coal and ion-exchangeable Na-loaded coal) were pyrolyzed in a drop-tube reactor. The experimental results revealed that soot and tar yields of Na-loaded coals were significantly lower than that of acid-washed coals. Gasified Na can reduce the formation of big soot agglomerates. During coal primary pyrolysis, ion-exchangeable Na can reduce the amount and aromaticity of primary tar. Na released with volatiles can catalyze the cracking of aliphatic and aromatic compounds, inhibit the polymerization between aromatic rings, and promote the combination of soot/tar with oxygen-containing substances, resulting in the decrease of graphite crystallite size and the increase of amorphous carbon content. Na can also reduce the organization degree of soot by forming intercalation compounds.
Heming Dong; Yu Zhang; Qian Du; Dun Li; Dongdong Feng; Jianmin Gao; Shaohua Wu; Jiyi Luan. Roles of Ion-Exchangeable Sodium in the Conversion Process of Tar to Soot during Rapid Pyrolysis of Two Brown Coals in a Drop-Tube Reactor. ACS Omega 2020, 5, 9078 -9092.
AMA StyleHeming Dong, Yu Zhang, Qian Du, Dun Li, Dongdong Feng, Jianmin Gao, Shaohua Wu, Jiyi Luan. Roles of Ion-Exchangeable Sodium in the Conversion Process of Tar to Soot during Rapid Pyrolysis of Two Brown Coals in a Drop-Tube Reactor. ACS Omega. 2020; 5 (16):9078-9092.
Chicago/Turabian StyleHeming Dong; Yu Zhang; Qian Du; Dun Li; Dongdong Feng; Jianmin Gao; Shaohua Wu; Jiyi Luan. 2020. "Roles of Ion-Exchangeable Sodium in the Conversion Process of Tar to Soot during Rapid Pyrolysis of Two Brown Coals in a Drop-Tube Reactor." ACS Omega 5, no. 16: 9078-9092.
The combined heating and power (CHP) system with turbine-driving fans and pumps is more efficient and economical in meeting heat demand in cold areas, however, there are no detailed studies that investigate its thermodynamic performance, improvement possibilities and economy. In this paper, the energy, exergy and economic analysis of a CHP system with turbine-driving fans and pumps operated in Northeast China were conducted to provide insights into improvement options. It is revealed that the boiler is the main source of exergy destruction, followed by the steam-water heat exchangers (SWHE), temperature and pressure reducer (TPR), turbines, and deaerator. The energy and exergy efficiencies of the system are 89.72% and 10.07%, while the boiler’s are 84.89% and 30.04%. The thermodynamic performance of the boiler and turbines are compared with other studies, and the inefficiencies of major components are analyzed and some advice for further improvement is given. As the reference state changes, the main conclusions stay the same. The turbine-driving mode saves an electricity cost of 16,654.08 yuan on 15 December 2018. The effect of electricity price and on-grid price on the saved daily electricity cost is investigated and it proves that the turbine-driving mode is more economical in China.
Ximei Li; Jianmin Gao; Yaning Zhang; Yu Zhang; Qian Du; Shaohua Wu; Yukun Qin. Energy, Exergy and Economic Analyses of a Combined Heating and Power System with Turbine-Driving Fans and Pumps in Northeast China. Energies 2020, 13, 878 .
AMA StyleXimei Li, Jianmin Gao, Yaning Zhang, Yu Zhang, Qian Du, Shaohua Wu, Yukun Qin. Energy, Exergy and Economic Analyses of a Combined Heating and Power System with Turbine-Driving Fans and Pumps in Northeast China. Energies. 2020; 13 (4):878.
Chicago/Turabian StyleXimei Li; Jianmin Gao; Yaning Zhang; Yu Zhang; Qian Du; Shaohua Wu; Yukun Qin. 2020. "Energy, Exergy and Economic Analyses of a Combined Heating and Power System with Turbine-Driving Fans and Pumps in Northeast China." Energies 13, no. 4: 878.
Ion-exchanged Na (INa) and adsorbed Na (ANa) concentrations have significant impact on the physicochemical properties of coal-derived aerosol, and product yields of soot and tar. INa effectively reduced tar release during primary pyrolysis, thus reducing soot yield. ANa had no clear effect on primary pyrolysis, but was easier to gasify. During the secondary pyrolysis, low-concentrated gasified Na promoted aggregation of aromatics to form soot disordered core and increased soot yield. However, at sufficiently high concentration, Na mainly catalyzed tar cracking. Gasified Na can change size distribution of soot aggregates and promote the conversion of SO2 to SO42-. These two effects of Na were affected by Cl in pyrolysis gas. Na in soot can change the arrangement of graphite-like layers and increase sp3 hybridized carbon bonding. INa can couple to carboxylate (COO ) and promote formation of ether C-O structures in soot or tar.
Heming Dong; Qian Du; Dun Li; Dongdong Feng; Jianmin Gao; Shaohua Wu. Impact of Sodium on the Formation Mechanism and Physicochemical Properties of Coal-Derived Soot. Energy & Fuels 2020, 34, 1453 -1466.
AMA StyleHeming Dong, Qian Du, Dun Li, Dongdong Feng, Jianmin Gao, Shaohua Wu. Impact of Sodium on the Formation Mechanism and Physicochemical Properties of Coal-Derived Soot. Energy & Fuels. 2020; 34 (2):1453-1466.
Chicago/Turabian StyleHeming Dong; Qian Du; Dun Li; Dongdong Feng; Jianmin Gao; Shaohua Wu. 2020. "Impact of Sodium on the Formation Mechanism and Physicochemical Properties of Coal-Derived Soot." Energy & Fuels 34, no. 2: 1453-1466.
The low-temperature heat-exchange section of boiler tails differs from other sections by absorbing latent heat. The subcooling of water vapor droplets in natural gas flue gas in boiler tails is becoming increasingly important. However, little is known about heat transfer and the subcooling mechanism. We report an airtight condensation cavity table and use thermal imaging to monitor the surface temperature and time-dependent size of single droplets. We observed a temperature gradient in droplets; three distinct size distributions; a change in infiltration mode from Wenzel to Cassie when non-condensing gas was introduced; and accelerated departure of droplets in a sound field.
Jingwei Yu; Jianmin Gao; Zheng Chen; Qian Du; Zhaoyang Cui; Dun Li. Supercooling of steam condensation in natural gas fumes. Energy Sources, Part A: Recovery, Utilization, and Environmental Effects 2019, 1 -14.
AMA StyleJingwei Yu, Jianmin Gao, Zheng Chen, Qian Du, Zhaoyang Cui, Dun Li. Supercooling of steam condensation in natural gas fumes. Energy Sources, Part A: Recovery, Utilization, and Environmental Effects. 2019; ():1-14.
Chicago/Turabian StyleJingwei Yu; Jianmin Gao; Zheng Chen; Qian Du; Zhaoyang Cui; Dun Li. 2019. "Supercooling of steam condensation in natural gas fumes." Energy Sources, Part A: Recovery, Utilization, and Environmental Effects , no. : 1-14.
The comprehensive and quantitative assessment of the contribution of minerals with different occurrence forms to particulate matter with an aerodynamic diameter of less than 10 μm (PM10) emitted from the combustion of Zhundong coal is of great significance for its clean utilization and for the development of particulate matter formation mechanisms. Samples with simplified occurrence forms of inorganic species were prepared by water-, salt-, and acid-washing of Zhundong coal. The samples were combusted in a drop-tube furnace under 20 vol % oxygen at 1250 °C, and the emitted PM10 was collected. The effects of the minerals in different forms on the PM10 emissions were analyzed by comparing the mass concentration distributions, yields, and elemental compositions of PM10. The results showed that water-soluble, ion-exchangeable, acid-soluble, and acid-insoluble minerals contributed 8.3%, 37.8%, 29.7%, and 24.2% of the PM10 emissions, respectively. The distributions of the Na, Mg, Ca, and Fe contents in PM10 were bimodal, as follows: 63.6% of Na and 54.5% of Fe were deported to the ultrafine mode PM, while 63.6% of Mg and 86.6% of Ca were deported to the coarse mode PM. The distributions of the Si and Al contents were unimodal, namely: 92.9% of Si and 90.5% of Al were deported to the coarse mode PM. Water-soluble Na; ion-exchanged Mg, Ca, and Fe; and acid-insoluble Si and Al played decisive roles in the distribution of minerals in PM10.
Laifu Zhao; Qian Du; Jianmin Gao; Shaohua Wu. Contribution of Minerals in Different Occurrence Forms to PM10 Emissions during the Combustion of Pulverized Zhundong Coal. Energies 2019, 12, 3629 .
AMA StyleLaifu Zhao, Qian Du, Jianmin Gao, Shaohua Wu. Contribution of Minerals in Different Occurrence Forms to PM10 Emissions during the Combustion of Pulverized Zhundong Coal. Energies. 2019; 12 (19):3629.
Chicago/Turabian StyleLaifu Zhao; Qian Du; Jianmin Gao; Shaohua Wu. 2019. "Contribution of Minerals in Different Occurrence Forms to PM10 Emissions during the Combustion of Pulverized Zhundong Coal." Energies 12, no. 19: 3629.
Inspired by the architectural feature of the natural enzyme of carbon monoxide dehydrogenase, cysteamine-capped Au nanoparticles (CA–Au NPs) are investigated with remarkable mass activity for CO2 reduction. CA–Au NPs exhibit exclusive CO selectivity, low onset overpotential, and a 110-fold enhancement in mass activity compared with ligand-free Au NPs. Electronic structure and in situ spectroscopy analysis indicate that increased activity is due to the electronic effect derived from thiolate anchoring on the surface and chemisorbing CO2 and intermediates by terminated –NH2 functional groups. Our study provides basis on fabricating effective catalysts for CO2 reduction.
Zhijiang Wang; Kun Sun; Caiyun Liang; Lina Wu; Zhuangzhuang Niu; Jianmin Gao. Synergistic Chemisorbing and Electronic Effects for Efficient CO2 Reduction Using Cysteamine-Functionalized Gold Nanoparticles. ACS Applied Energy Materials 2018, 2, 192 -195.
AMA StyleZhijiang Wang, Kun Sun, Caiyun Liang, Lina Wu, Zhuangzhuang Niu, Jianmin Gao. Synergistic Chemisorbing and Electronic Effects for Efficient CO2 Reduction Using Cysteamine-Functionalized Gold Nanoparticles. ACS Applied Energy Materials. 2018; 2 (1):192-195.
Chicago/Turabian StyleZhijiang Wang; Kun Sun; Caiyun Liang; Lina Wu; Zhuangzhuang Niu; Jianmin Gao. 2018. "Synergistic Chemisorbing and Electronic Effects for Efficient CO2 Reduction Using Cysteamine-Functionalized Gold Nanoparticles." ACS Applied Energy Materials 2, no. 1: 192-195.
One of the main challenges of the ammonia-based CO2 capture process is how to further reduce the regeneration energy consumption. An antisolvent crystallization method was proposed to strengthen the crystallization process of carbonized ammonia, and heating the crystal products instead of rich solution can greatly reduce renewable energy consumption. The main component of the crystal product was NH4HCO3 analyzed by X-ray diffraction. Therefore, it is very important to study the thermodynamic properties of ammonium bicarbonate in the ternary system of NH3–H2O–ethanol. In this paper, the solubility curves under different temperature and solvent compositions were determined by static method and the mathematical model of solubility was established. The effects of the addition of ammonium carbamate which was produced in the initial stage of the CO2 absorption process and the addition of ammonia on the solubility in ternary system of NH4HCO3–H2O–ethanol were studied. The dissolution heat was also calculated in the end. The research of this article has a guiding significance for the antisolvent method to strengthen the crystallization of carbonized ammonia of ammonia-based carbon capture technology. It is helpful to further strengthen the crystallization process of low carbonized ammonia and improve the crystallization yield.
Yu Zhang; Dongdong Feng; Jianmin Gao; Qian Du; Shaohua Wu. Thermodynamic properties in ternary system of NH4HCO3–H2O–ethanol based on antisolvent method to strengthen crystallization of carbonized ammonia. Adsorption Science & Technology 2018, 37, 127 -138.
AMA StyleYu Zhang, Dongdong Feng, Jianmin Gao, Qian Du, Shaohua Wu. Thermodynamic properties in ternary system of NH4HCO3–H2O–ethanol based on antisolvent method to strengthen crystallization of carbonized ammonia. Adsorption Science & Technology. 2018; 37 (1-2):127-138.
Chicago/Turabian StyleYu Zhang; Dongdong Feng; Jianmin Gao; Qian Du; Shaohua Wu. 2018. "Thermodynamic properties in ternary system of NH4HCO3–H2O–ethanol based on antisolvent method to strengthen crystallization of carbonized ammonia." Adsorption Science & Technology 37, no. 1-2: 127-138.
Particle size distributions, concentrations, morphological characteristics, and elemental compositions of PM2.5 from 15 industrial layer-burning boilers were determined experimentally in air, before and after dust removal and after desulfurization processes. The morphological characteristics and elemental compositions were analyzed using scanning electron microscopy and X-ray fluorescence, respectively. The concentrations and particle size distributions of PM2.5 were monitored and sampled using an electrostatic low pressure impactor. We found that before and after dust removal, the number concentration distributions of PM2.5 displayed obvious unimodal distributions, with peaks in the range 0.07∼0.38 μm. In both instances, the particle concentrations of PM2.5 depended mainly on submicron particles (less than 1 μm in diameter), formed by gasification-condensation mechanisms. The concentration of the particles larger than 0.38 μm reflected aggregation of carbon black particles; this fraction tended to gradually decrease in concentration with increasing size. Total number and mass removal efficiencies of PM2.5 indicate that fabric filters were superior to mechanical precipitators, although mechanical precipitators were superior to integrated dust removal and desulfurization devices. Typically, the number concentration increased after desulfurization, suggesting that better demisters need to be implemented in these systems. The PM2.5 generated by industrial layer-burning boilers mainly comprised soot aggregates. However, the mass percentages of S, Si, K, and Al in PM2.5 decreased after dust removal but increased after the desulfurization. In contrast, the mass percentage of Na in PM2.5 increased after both dust removal and desulfurization processes, while the mass percentages of Ca and Fe in PM2.5 decreased after dust removal but remained constant after desulfurization. These data clearly show that the composition of PM2.5 changes as dust and sulfur are removed by air pollution control devices. Data generated in this study are useful for selecting the most effective strategy for reducing PM2.5 emitted by industrial layer-burning boilers of various sizes.
Qian Du; Zhaoyang Cui; Heming Dong; Jianmin Gao; Dun Li; Jingwei Yu; Yinuo Liu. Field measurements on the generation and emission characteristics of PM2.5 generated by industrial layer burning boilers. Journal of the Energy Institute 2018, 92, 1251 -1261.
AMA StyleQian Du, Zhaoyang Cui, Heming Dong, Jianmin Gao, Dun Li, Jingwei Yu, Yinuo Liu. Field measurements on the generation and emission characteristics of PM2.5 generated by industrial layer burning boilers. Journal of the Energy Institute. 2018; 92 (5):1251-1261.
Chicago/Turabian StyleQian Du; Zhaoyang Cui; Heming Dong; Jianmin Gao; Dun Li; Jingwei Yu; Yinuo Liu. 2018. "Field measurements on the generation and emission characteristics of PM2.5 generated by industrial layer burning boilers." Journal of the Energy Institute 92, no. 5: 1251-1261.
A self-flushing wet electrostatic precipitator was developed to investigate the removal performance for fine particles. Flexible material (polypropylene, 840A) and carbon steel in the form of a spiked band were adopted as the collection plate and discharge electrode, respectively. The particle concentration, morphology, and trace-element content were measured by electric low-pressure impactor, scanning electron microscope, and energy-dispersive x-ray spectroscopy, respectively, before and after the electrostatic precipitator. With increasing gas velocity, the collection efficiency of fine particles (up to 0.8 μm in diameter) increased, while it decreased for particles with diameters larger than 0.8 μm. Increasing the dust inlet concentration increased the collection efficiency up to a point, from which it then declined gradually with further increases in the inlet concentration. The particulate matter after the wet electrostatic precipitator showed different degrees of agglomeration. The collection efficiency of trace elements within PM10 was less than that of the PM10 itself. Notably, the water consumption in the current setup was significantly lower than for other treatment processes of comparable collection efficiencies. Implications: Wet electrostatic precipitators, as fine filtration equipment, were generally applicable to coal-fired plants to reduce PM2.5 emissions in China. However, high energy consumption and unstable operation, such as water usage and spray washing directly in the electric field, seriously restricted the further development. The utilization of self-flushing wet electrostatic precipitator can solve these problems to some extent.
Lipeng Su; Qian Du; Yide Wang; Heming Dong; Jianmin Gao; Min Wang; Peng Dong. Purification characteristics of fine particulate matter treated by a self-flushing wet electrostatic precipitator equipped with a flexible electrode. Journal of the Air & Waste Management Association 2018, 68, 725 -736.
AMA StyleLipeng Su, Qian Du, Yide Wang, Heming Dong, Jianmin Gao, Min Wang, Peng Dong. Purification characteristics of fine particulate matter treated by a self-flushing wet electrostatic precipitator equipped with a flexible electrode. Journal of the Air & Waste Management Association. 2018; 68 (7):725-736.
Chicago/Turabian StyleLipeng Su; Qian Du; Yide Wang; Heming Dong; Jianmin Gao; Min Wang; Peng Dong. 2018. "Purification characteristics of fine particulate matter treated by a self-flushing wet electrostatic precipitator equipped with a flexible electrode." Journal of the Air & Waste Management Association 68, no. 7: 725-736.
Jianmin Gao; Zhihao Sun; Zhiqiang Wang; Xin Wang; Jian Guan; Guoli Qi; Zhongwei Wang; Qian Du; Yukun Qin. Measurement method and influencing factors of temperature and humidity of condensed flue gas based on in situ flue gas heat tracing. Measurement 2018, 120, 100 -106.
AMA StyleJianmin Gao, Zhihao Sun, Zhiqiang Wang, Xin Wang, Jian Guan, Guoli Qi, Zhongwei Wang, Qian Du, Yukun Qin. Measurement method and influencing factors of temperature and humidity of condensed flue gas based on in situ flue gas heat tracing. Measurement. 2018; 120 ():100-106.
Chicago/Turabian StyleJianmin Gao; Zhihao Sun; Zhiqiang Wang; Xin Wang; Jian Guan; Guoli Qi; Zhongwei Wang; Qian Du; Yukun Qin. 2018. "Measurement method and influencing factors of temperature and humidity of condensed flue gas based on in situ flue gas heat tracing." Measurement 120, no. : 100-106.
Using double film theory, the mass transfer in the absorption process in ammonia-based CO2 capture under a static magnetic field was investigated in a bubbling reactor. The effect of the gas flow rate, CO2 inlet concentration, ammonia concentration, and reaction temperature on the interfacial area and mass transfer coefficients were investigated. Under a static magnetic field, the volumetric mass transfer coefficient of CO2 absorption for an ammonia concentration of 10 wt% reached 18.7×105 mol/(m3 s Pa), which was 15.3% higher than that achieved without the magnetic field. By introducing the magnetic field, the estimated interfacial area per unit volume increased from 177.44 to 199.2 m2/m3 and the CO2 absorption process was promoted. In addition, the overall volumetric mass transfer coefficient and estimated interfacial area per unit volume were improved.
Dongdong Feng; Jianmin Gao; Yu Zhang; Huiyi Li; Qian Du; Shaohua Wu. Mass transfer in ammonia-based CO2 absorption in bubbling reactor under static magnetic field. Chemical Engineering Journal 2018, 338, 450 -456.
AMA StyleDongdong Feng, Jianmin Gao, Yu Zhang, Huiyi Li, Qian Du, Shaohua Wu. Mass transfer in ammonia-based CO2 absorption in bubbling reactor under static magnetic field. Chemical Engineering Journal. 2018; 338 ():450-456.
Chicago/Turabian StyleDongdong Feng; Jianmin Gao; Yu Zhang; Huiyi Li; Qian Du; Shaohua Wu. 2018. "Mass transfer in ammonia-based CO2 absorption in bubbling reactor under static magnetic field." Chemical Engineering Journal 338, no. : 450-456.
To study the role of gasifying agents (H2O/CO2) on the improvement and maintenance of biochar catalytic activity for in situ biomass tar reforming, experiments were carried out in a two-stage fluidized-bed/fixed-bed reactor. The physicochemical properties of biochar, which are responsible for its catalytic activity during tar reforming, were analyzed by ICP–AES, SEM–EDX, BET and XPS methods. The conversion of biomass tar was investigated by GC–MS. Adding H2O or CO2 was found to improve the homogeneous and heterogeneous reforming of biomass tar, the latter of which involved first forming an intermediary coke product that was subsequently gasified by H2O/CO2. Activation of biochar by H2O/CO2 impacted the biochar surface's morphology and distribution of metal species. During tar reforming, the presence of H2O/CO2 also affected the creation and regeneration of pore structures, influencing the biochar's structure and dynamically distributing AAEM species, which ensured enough surface active sites to maintain the biochar's catalytic activity. CO2 produced more micropores in the biochar, whereas H2O favored the formation of mesopores, which are more important for tar reforming. The addition of H2O/CO2 was found to notably enhance in situ reforming of both large and small aromatic ring systems in biomass tar over biochar.
Dongdong Feng; Yu Zhang; Yijun Zhao; Shaozeng Sun; Jianmin Gao. Improvement and maintenance of biochar catalytic activity for in-situ biomass tar reforming during pyrolysis and H2O/CO2 gasification. Fuel Processing Technology 2018, 172, 106 -114.
AMA StyleDongdong Feng, Yu Zhang, Yijun Zhao, Shaozeng Sun, Jianmin Gao. Improvement and maintenance of biochar catalytic activity for in-situ biomass tar reforming during pyrolysis and H2O/CO2 gasification. Fuel Processing Technology. 2018; 172 ():106-114.
Chicago/Turabian StyleDongdong Feng; Yu Zhang; Yijun Zhao; Shaozeng Sun; Jianmin Gao. 2018. "Improvement and maintenance of biochar catalytic activity for in-situ biomass tar reforming during pyrolysis and H2O/CO2 gasification." Fuel Processing Technology 172, no. : 106-114.
The performance of ammonia-based CO2 absorption under static magnetic field conditions was discussed. The removal efficiency of CO2, CO2 load, and absorption capacities were studied using a bubble reactor system. The CO2 removal efficiencies, CO2 load, and absorption capacity under static magnetic field conditions were calculated at four kinds of different operating conditions, which included CO2 concentration in flue gas, gas flow rate, concentrations of aqueous ammonia, and reaction temperature. The results indicated that the initial removal efficiency of CO2 can reach 98.5% by 10 wt% ammonia solution under static magnetic field conditions, and it is 7% higher than that under the no magnetic field conditions. The effect of magnetic field on CO2 load and absorption capacity is more obvious when the inlet CO2 concentration in the simulated flue gas is 10 vol%, the CO2 load increases 11.7% from 1.45 mol/L to 1.62 mol/L, and the absorption capacity rises from 0.668 kgCO2/kgNH3 to 0.738 kgCO2/kgNH3. Compared with the absorption of CO2 under static magnetic field conditions and no magnetic field conditions, the absorption process of CO2 is enhanced by the magnetic field, and the removal efficiency of CO2, CO2 load and absorption capacity show superior performance. This article is protected by copyright. All rights reserved
Yu Zhang; Jianmin Gao; Dongdong Feng; Qian Du; Shaohua Wu. Effect of magnetic field on the ammonia-based CO2 absorption process. The Canadian Journal of Chemical Engineering 2018, 96, 1462 -1467.
AMA StyleYu Zhang, Jianmin Gao, Dongdong Feng, Qian Du, Shaohua Wu. Effect of magnetic field on the ammonia-based CO2 absorption process. The Canadian Journal of Chemical Engineering. 2018; 96 (7):1462-1467.
Chicago/Turabian StyleYu Zhang; Jianmin Gao; Dongdong Feng; Qian Du; Shaohua Wu. 2018. "Effect of magnetic field on the ammonia-based CO2 absorption process." The Canadian Journal of Chemical Engineering 96, no. 7: 1462-1467.
The effect of chemical speciation (H2O/NH4Ac/HCl-soluble and insoluble) of alkali and alkaline earth metallic species on the steam gasification of sawdust biochar was investigated in a lab-scale, fixed-bed reactor, with the method of chemical fractionation analysis. The changes in biochar structures and the evolution of biochar reactivity are discussed, with a focus on the contributions of the chemical speciation of alkali and alkaline earth metallic species (AAEMs) on the steam gasification of biochar. The results indicate that H2O/NH4Ac/HCl-soluble AAEMs have a significant effect on biochar gasification rates. The release of K occurs mainly in the form of inorganic salts and hydrated ions, while that of Ca occurs mainly as organic ones. The sp3-rich or sp2-sp3 structures and different chemical-speciation AAEMs function together as the preferred active sites during steam gasification. H2O/HCl-soluble AAEMs could promote the transformation of biochar surface functional groups, from ether/alkene C-O-C to carboxylate COO− in biochar, while they may both be improved by NH4Ac-soluble AAEMs. H2O-soluble AAEMs play a crucial catalytic role in biochar reactivity. The effect of NH4Ac-soluble AAEMs is mainly concentrated in the high-conversion stage (biochar conversion >30%), while that of HCl-soluble AAEMs is reflected in the whole activity-testing stage.
Dongdong Feng; Yijun Zhao; Yu Zhang; Shaozeng Sun; Jianmin Gao. Steam Gasification of Sawdust Biochar Influenced by Chemical Speciation of Alkali and Alkaline Earth Metallic Species. Energies 2018, 11, 205 .
AMA StyleDongdong Feng, Yijun Zhao, Yu Zhang, Shaozeng Sun, Jianmin Gao. Steam Gasification of Sawdust Biochar Influenced by Chemical Speciation of Alkali and Alkaline Earth Metallic Species. Energies. 2018; 11 (1):205.
Chicago/Turabian StyleDongdong Feng; Yijun Zhao; Yu Zhang; Shaozeng Sun; Jianmin Gao. 2018. "Steam Gasification of Sawdust Biochar Influenced by Chemical Speciation of Alkali and Alkaline Earth Metallic Species." Energies 11, no. 1: 205.
Mixing coal char into coal powder and enhancing its reactivity with NO in the combustion process of a layer burning furnace is an effective method to realize low-cost resource reduction of NOx. To enhance NO reducibility of char at high temperatures, this study used Shuozhou bituminous coal to prepare different nitriding chars (char modified by nitrogen doping) by changing the nitrogen agent, the dosage of nitrogen agent, and the treatment method. The effects of different nitriding conditions on the NO reducibility of char were evaluated using a programmed temperature rising method. The results show that NO reducibility of char is improved in different degrees after nitriding treatment, which is related to the improvement of pore structure and the formation of nitrogen-containing functional groups. The NO reducibility of char is enhanced in the high-temperature region when increasing the dosage of urea, but excessive urea amounts can hinder the porosity development of char, resulting in the decline of NO reduction efficiency. Ammonium bicarbonate as a nitrogen agent shows better effects on NO reduction below 725 °C compared with urea, but weaker effects above 725 °C. Furthermore, heat treatment can weaken the effect of nitrogen doping, but the overall trend of NO reduction curve is almost unchanged.
Xin Wang; Jianmin Gao; Zhihao Sun; Jian Cheng; Li Xu; Qian Du; Yukun Qin. Effect of nitrogen doping on reactivity of coal char in reducing NO. The Canadian Journal of Chemical Engineering 2017, 96, 873 -880.
AMA StyleXin Wang, Jianmin Gao, Zhihao Sun, Jian Cheng, Li Xu, Qian Du, Yukun Qin. Effect of nitrogen doping on reactivity of coal char in reducing NO. The Canadian Journal of Chemical Engineering. 2017; 96 (4):873-880.
Chicago/Turabian StyleXin Wang; Jianmin Gao; Zhihao Sun; Jian Cheng; Li Xu; Qian Du; Yukun Qin. 2017. "Effect of nitrogen doping on reactivity of coal char in reducing NO." The Canadian Journal of Chemical Engineering 96, no. 4: 873-880.
Dongdong Feng; Yijun Zhao; Yu Zhang; Jianmin Gao; Shaozeng Sun. Changes of biochar physiochemical structures during tar H2O and CO2 heterogeneous reforming with biochar. Fuel Processing Technology 2017, 165, 72 -79.
AMA StyleDongdong Feng, Yijun Zhao, Yu Zhang, Jianmin Gao, Shaozeng Sun. Changes of biochar physiochemical structures during tar H2O and CO2 heterogeneous reforming with biochar. Fuel Processing Technology. 2017; 165 ():72-79.
Chicago/Turabian StyleDongdong Feng; Yijun Zhao; Yu Zhang; Jianmin Gao; Shaozeng Sun. 2017. "Changes of biochar physiochemical structures during tar H2O and CO2 heterogeneous reforming with biochar." Fuel Processing Technology 165, no. : 72-79.