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Microscopic mechanism study and process optimization of dimethyl carbonate production coupled biomass chemical looping gasification system 被引量:1
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作者 Wende Tian Jiawei Zhang +2 位作者 Zhe Cui Haoran Zhang Bin Liu 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2023年第6期291-305,共15页
Biomass chemical looping gasification technology is one of the essential ways to utilize abundant biomass resources.At the same time,dimethyl carbonate can replace phosgene as an environmentfriendly organic material f... Biomass chemical looping gasification technology is one of the essential ways to utilize abundant biomass resources.At the same time,dimethyl carbonate can replace phosgene as an environmentfriendly organic material for the synthesis of polycarbonate.In this paper,a novel system coupling biomass chemical looping gasification with dimethyl carbonate synthesis with methanol as an intermediate is designed through microscopic mechanism analysis and process optimization.Firstly,reactive force field molecular dynamics simulation is performed to explore the reaction mechanism of biomass chemical looping gasification to determine the optimal gasification temperature range.Secondly,steady-state simulations of the process based on molecular dynamics simulation results are carried out to investigate the effects of temperature,steam to biomass ratio,and oxygen carrier to biomass ratio on the syngas yield and compositions.In addition,the main energy indicators of biomass chemical looping gasification process including lower heating value and cold gas efficiency are analyzed based on the above optimum parameters.Then,two synthesis stages are simulated and optimized with the following results obtained:the optimal temperature and pressure of methanol synthesis stage are 150℃ and 4 MPa;the optimal temperature and pressure of dimethyl carbonate synthesis stage are 140℃ and 0.3 MPa.Finally,the pre-separation-extraction-decantation process separates the mixture of dimethyl carbonate and methanol generated in the synthesis stage with 99.11%purity of dimethyl carbonate.Above results verify the feasibility of producing dimethyl carbonate from the perspective of multi-scale simulation and realize the multi-level utilization of biomass resources. 展开更多
关键词 biomass chemical looping gasification Reactive force field molecular dynamics simulation SEPARATION Multi-scale simulation
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A new horizontal in C1 chemistry: Highly selective conversion of syngas to light olefins by a novel OX-ZEO process 被引量:1
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作者 Ye Wang 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2016年第2期167-168,共2页
The most challenging goal of C1 chemistry is the control of C–C coupling to produce chemicals or fuels from C1 feedstocks,in particular syngas(H2/CO),which can be derived from various carbon resources such as coal,... The most challenging goal of C1 chemistry is the control of C–C coupling to produce chemicals or fuels from C1 feedstocks,in particular syngas(H2/CO),which can be derived from various carbon resources such as coal,natural gas or shale gas,and biomass. 展开更多
关键词 challenging propylene chemicals shale Highly biomass selectivity hydrocarbons currently naphtha
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Hydrothermal Liquefaction of Lignin 被引量:1
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作者 Julia Schuler Ursel Hornung +2 位作者 Andrea Kruse Nicolaus Dahmen Jorg Sauer 《Journal of Biomaterials and Nanobiotechnology》 2017年第1期96-108,共13页
The majority of platform chemicals are currently provided through crude oil processes. Nevertheless, the substitution of the crude oil with biomass should be the ecological aim. Lignin, an aromatic macromolecule, may ... The majority of platform chemicals are currently provided through crude oil processes. Nevertheless, the substitution of the crude oil with biomass should be the ecological aim. Lignin, an aromatic macromolecule, may play an important role in that exchange, as it is the only bio based source of aromatic compounds. For instance, it could be a source of bifunctional aromatic molecules, like the monocyclic compounds catechol or guaiacol, or bifunctional oligomers. However, no process for the production of aromatics from lignin in technical scale has been established until now. Hence, the focus of this work is to clarify the chemical degradation mechanism under hydrothermal conditions, to liquefy lignin delivering high functional molecules and to increase the yield and selectivity of the cleavage towards bifunctional molecules like catechol. The combination of fast hydrolysis, thermal degradation reactions and hydrogenation drives the hydrothermal liquefaction;this gives the possibility to narrow down the product spectrum in comparison to other “dry” cleavage methods, towards a higher yield of e.g. catechols. 展开更多
关键词 Lignin Liquefaction Hydrothermal Cleavage Chemical Use of biomass
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Chemical composition and physical properties of filter fly ashes from eight grate-fired biomass combustion plants 被引量:4
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作者 Christof Lanzerstorfer 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2015年第4期191-197,共7页
For the handling, treatment and utilization of fly ash from biomass combustion its chemical composition and physical properties are important. In this study eight filter fly ashes from different grate-fired biomass co... For the handling, treatment and utilization of fly ash from biomass combustion its chemical composition and physical properties are important. In this study eight filter fly ashes from different grate-fired biomass combustion plants were investigated. In fly ash from straw combustion high concentrations of(K) were found, whereas in the fly ash from wood combustion the concentrations of Ca and Mg were higher. The average concentration of PO3-4was similar in both types of fly ashes. In all wood fly ashes some measured heavy metal concentrations were above the limits for utilization. The straw fly ashes were much less contaminated and can be utilized. For wood fly ash most parameters showed little variation, except from one fly ash where the dust pre-separator is in poor condition. The average values were: mass median diameter 4.3 ± 0.8 μm, spread of particle size distribution19 ± 11, particle density 2620 ± 80 kg/m^3 and angle of repose 50°± 1°. The density of the straw fly ashes is lower(2260 ± 80 kg/m^3) and the spread of the size distribution is higher(72 ± 24).For one straw combustion fly ash the values of the mass median diameter and the angle of repose were similar to the values of wood combustion fly ash, for the other straw fly ash the values differed considerably. While the particle size of this fly ash was much smaller,surprisingly the angle of repose was also lower. This can be attributed to the formation of small agglomerates in this fly ash, which were not disintegrated without a certain stress. 展开更多
关键词 biomass combustion Filter fly ash Chemical analysis Physical properties
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Characteristics of biomass ashes from different materials and their ameliorative effects on acid soils 被引量:5
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作者 Renyong Shi Jiuyu Li +4 位作者 Jun Jiang Khalid Mehmood Yuan Liu Renkou Xu Wei Qian 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2017年第5期294-302,共9页
The chemical characteristics,element contents,mineral compositions,and the ameliorative effects on acid soils of five biomass ashes from different materials were analyzed. The chemical properties of the ashes varied d... The chemical characteristics,element contents,mineral compositions,and the ameliorative effects on acid soils of five biomass ashes from different materials were analyzed. The chemical properties of the ashes varied depending on the source biomass material. An increase in the concrete shuttering contents in the biomass materials led to higher alkalinity,and higher Ca and Mg levels in biomass ashes,which made them particularly good at ameliorating effects on soil acidity. However,heavy metal contents,such as Cr,Cu,and Zn in the ashes,were relatively high. The incorporation of all ashes increased soil p H,exchangeable base cations,and available phosphorus,but decreased soil exchangeable acidity. The application of the ashes from biomass materials with a high concrete shuttering content increased the soil available heavy metal contents. Therefore,the biomass ashes from wood and crop residues with low concrete contents were the better acid soil amendments. 展开更多
关键词 biomass ashes Raw materials Element composition Chemical properties Amelioration of acidic soils Available heavy metals
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Emissions from the combustion of eucalypt and pine chips in a fluidized bed reactor 被引量:1
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作者 E.D.Vicente L.A.C.Tarelho +7 位作者 E.R.Teixeira M.Duarte T.Nunes C.Colombi V.Gianelle G.O.da Rocha A.Sanchez de la Campa C.A.Alves 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2016年第4期246-258,共13页
Interest in renewable energy sources has increased in recent years due to environmental concerns about global warming and air pollution,reduced costs and improved efficiency of technologies.Under the European Union(E... Interest in renewable energy sources has increased in recent years due to environmental concerns about global warming and air pollution,reduced costs and improved efficiency of technologies.Under the European Union(EU)energy directive,biomass is a suitable renewable source.The aim of this study was to experimentally quantify and characterize the emission of particulate matter(PM(2.5))resulting from the combustion of two biomass fuels(chipped residual biomass from pine and eucalypt),in a pilot-scale bubbling fluidized bed(BFB)combustor under distinct operating conditions.The variables evaluated were the stoichiometry and,in the case of eucalypt,the leaching of the fuel.The CO and PM(2.5)emission factors were lower when the stoichiometry used in the experiments was higher(0.33±0.1 g CO/kg and 16.8±1.0 mg PM(2.5)/kg,dry gases).The treatment of the fuel by leaching before its combustion has shown to promote higher PM(2.5)emissions(55.2±2.5 mg/kg,as burned).Organic and elemental carbon represented 3.1 to 30 wt.% of the particle mass,while carbonate(CO3^(2-))accounted for between 2.3 and 8.5 wt.%.The particulate mass was mainly composed of inorganic matter(71% to 86% of the PM(2.5)mass).Compared to residential stoves,BFB combustion generated very high mass fractions of inorganic elements.Chloride was the water soluble ion in higher concentration in the PM(2.5)emitted by the combustion of eucalypt,while calcium was the dominant water soluble ion in the case of pine. 展开更多
关键词 biomass Combustion Fluidized bed PM2.5emissions Chemical composition
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