The Experts below are selected from a list of 9 Experts worldwide ranked by ideXlab platform
Ao Huang - One of the best experts on this subject based on the ideXlab platform.
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towards chrome free lining for Plasma Gasifiers using the ca6 sic castable based on high temperature water vapor corrosion
Ceramics International, 2019Co-Authors: Ding Chen, Ao HuangAbstract:Abstract This paper focuses on the water vapor corrosion mechanisms of calcium hexaluminate (CA6)-SiC, SiC, and MgAl2O4-Cr2O3 castables. The weight and linear change, mechanical performance, sintering properties, and pore-size distribution of the three castables were investigated before and after corrosion. Morphologies, chemical bonds, and phases were characterized by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and X-ray diffraction (XRD) respectively. Thermodynamic analysis was used to explain the chemical reaction during corrosion. The results show that the CA6 aggregates remain stable after 1000 °C × 100 h in wet air. However, SiC and Cr2O3 can react with the wet air. First, SiC reacts with O2 to form SiO2, then the siloxane network (Si-O-Si) of the SiO2 can be corroded to form silanol groups (Si-OH). The MgAl2O4-Cr2O3 castable exhibits weight loss and forms large pores after vapor corrosion because Cr2O3 reacts with H2O (g) and O2 (g) to form CrO2(OH)2 (g).
Ding Chen - One of the best experts on this subject based on the ideXlab platform.
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towards chrome free lining for Plasma Gasifiers using the ca6 sic castable based on high temperature water vapor corrosion
Ceramics International, 2019Co-Authors: Ding Chen, Ao HuangAbstract:Abstract This paper focuses on the water vapor corrosion mechanisms of calcium hexaluminate (CA6)-SiC, SiC, and MgAl2O4-Cr2O3 castables. The weight and linear change, mechanical performance, sintering properties, and pore-size distribution of the three castables were investigated before and after corrosion. Morphologies, chemical bonds, and phases were characterized by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and X-ray diffraction (XRD) respectively. Thermodynamic analysis was used to explain the chemical reaction during corrosion. The results show that the CA6 aggregates remain stable after 1000 °C × 100 h in wet air. However, SiC and Cr2O3 can react with the wet air. First, SiC reacts with O2 to form SiO2, then the siloxane network (Si-O-Si) of the SiO2 can be corroded to form silanol groups (Si-OH). The MgAl2O4-Cr2O3 castable exhibits weight loss and forms large pores after vapor corrosion because Cr2O3 reacts with H2O (g) and O2 (g) to form CrO2(OH)2 (g).
Dahiru R. - One of the best experts on this subject based on the ideXlab platform.
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CO₂ Removal from wood gas
University of Oulu, 2013Co-Authors: Dahiru R.Abstract:Abstract Gasification is considered as one of the most attractive conversion technologies, because the product gas from the process serves as a building block for several industrial applications. However, the use of biomass as a fuel in the gasification process offers a carbon neutral fuel that will alleviate the continuing use of fossil fuels sources. This study was done to evaluate the possible applications of syngas originating from biomass gasification, as a follow up to the earlier biomass gasification research of the HighBio project. The syngas from the gasification process is generally produced in a gasifier. An overview of the different type of Gasifiers for biomass gasification that include updraft, downdraft, crossdraft, entrained-flow and Plasma Gasifiers was presented. The syngas can be utilized in the generation of power, heat, fuels and chemicals. A detailed overview of the promising applications of the syngas in Fischer-Tropsch synthesis, hydrogen production, ammonia synthesis, hydroformylation of olefins, and syngas fermentation was also given. However, for these applications, a high degree of treatment and conditioning of the syngas is required. The treatment is usually carried out to remove undesirable impurities, while the conditioning of the gas is done to get the right H₂ to CO ratio for further applications of the syngas. Raw syngas from gasification processes can contains also impurities such as solid particulates, inorganic and organic impurities, which have to be removed. However, CO₂ is one of the major by-products in a gasification process. The removal of CO₂ is desirable in order to reduce the CO₂ emissions or to meet the downstream process requirement in relation to size and costs. Absorption processes are the most developed techniques in the separation of CO₂ in the industries. However, other techniques such as adsorption, membrane separation, and chemical-looping combustion have recently gained interest. Moreover, two MFI-types zeolite membranes (ZSM5-I and ZSM5-II) were tested in the separation of CO₂ from CO₂/N₂ mixtures in a laboratory scale experiments. Separation factor, gas permeability and CO₂ permeate flux were the parameters used to determine the membrane performance. The highest membrane performances of the feed gas compositions were achieved with low CO₂ gas composition, and at the low temperature separation experiments. However, in order to achieve high recovery and purity of CO₂, the separation experiment of the HighBio CO₂/N₂ feed composition using the ZSM5 zeolite membrane was evaluated at low temperature and constant feed and permeate pressures of 6 bar and 1 bar respectively. Based on the analysis, it is suggested that 6 successive membrane modules should be employed. Further investigations that incorporate other product gas compositions from biomass gasification, as well as the study of other type of inorganic membranes more suitable to CO₂/N₂ separation processes are highly recommended. The economic analysis of the multi-stage ZSM5 zeolite membrane separation could be also another interesting study
Bart Blanpain - One of the best experts on this subject based on the ideXlab platform.
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effect of gas slag interaction on valorisation of refuse derived fuel treated with Plasma gasification
Mineral Processing and Extractive Metallurgy, 2015Co-Authors: Pengcheng Yan, Lieven Pandelaers, Lieven Machiels, Yiannis Pontikes, Daneel Geysen, Muxing Guo, Bart BlanpainAbstract:AbstractDuring gasification of refuse derived fuel (RDF) to produce syngas in a system in which a melt is also produced, the gasified organic fraction of the RDF is in contact with the molten inorganic fraction, i.e. a slag. Examples of such systems are Plasma Gasifiers, in which crude syngas is further cracked in a Plasma converter. Depending on the degree of gas–slag interaction, their compositions may vary and influence the valorisation potential of both resources. To evaluate the influence of this interaction, a pseudo-kinetic model was developed based on local thermodynamic equilibrium between the gas phase and part of the slag phase. The interaction level was accounted for by varying the amount of the slag that equilibrates with the gas. The valorisation potential of the resulting gas and slag phases was evaluated in terms of the heat of combustion and the mineralogy after cooling, respectively. Engineering of the slag composition was made through lime-rich addition. The influence of waste compositi...
Pengcheng Yan - One of the best experts on this subject based on the ideXlab platform.
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effect of gas slag interaction on valorisation of refuse derived fuel treated with Plasma gasification
Mineral Processing and Extractive Metallurgy, 2015Co-Authors: Pengcheng Yan, Lieven Pandelaers, Lieven Machiels, Yiannis Pontikes, Daneel Geysen, Muxing Guo, Bart BlanpainAbstract:AbstractDuring gasification of refuse derived fuel (RDF) to produce syngas in a system in which a melt is also produced, the gasified organic fraction of the RDF is in contact with the molten inorganic fraction, i.e. a slag. Examples of such systems are Plasma Gasifiers, in which crude syngas is further cracked in a Plasma converter. Depending on the degree of gas–slag interaction, their compositions may vary and influence the valorisation potential of both resources. To evaluate the influence of this interaction, a pseudo-kinetic model was developed based on local thermodynamic equilibrium between the gas phase and part of the slag phase. The interaction level was accounted for by varying the amount of the slag that equilibrates with the gas. The valorisation potential of the resulting gas and slag phases was evaluated in terms of the heat of combustion and the mineralogy after cooling, respectively. Engineering of the slag composition was made through lime-rich addition. The influence of waste compositi...