The Experts below are selected from a list of 291 Experts worldwide ranked by ideXlab platform
Wenjie Qi - One of the best experts on this subject based on the ideXlab platform.
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The Influence of Slight Protuberances in a Micro-Tube Reactor on Methane/Moist Air Catalytic Combustion
Energies, 2016Co-Authors: Ruirui Wang, Xuesen Du, Wenjie QiAbstract:The combustion characteristics of methane/moist air in micro-tube reactors with different numbers and shapes of inner wall Protuberances are investigated in this paper. The micro-reactor with one rectangular protuberance (six different sizes) was studied firstly, and it is shown that reactions near the protuberance are mainly controlled by diffusion, which has little effect on the outlet temperature and methane conversion rate. The formation of cavities and recirculation zones in the vicinity of Protuberances leads to a significant increase of the Arrhenius reaction rate of CH 4 and gas velocity. Next, among the six different simulated conditions (0–5 rectangular Protuberances), the micro-tube reactor with five rectangular Protuberances shows the highest methane conversion rate. Finally, the effect of protuberance shape on methane/moist air catalytic combustion is confirmed, and it is found that the protuberance shape has a greater influence on methane conversion rate than the number of Protuberances. The methane conversion rate in the micro-tube decreases progressively in the following order: five triangular slight Protuberances > five rectangular Protuberances > five trapezoidal Protuberances > smooth tube. In all tests of methane/moist air combustion conditions, the micro-tube with five triangular Protuberances has the peak efficiency and is therefore recommended for high efficiency reactors.
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the influence of slight Protuberances in a micro tube reactor on methane moist air catalytic combustion
Energies, 2016Co-Authors: Ruirui Wang, Xuesen Du, Wenjie QiAbstract:The combustion characteristics of methane/moist air in micro-tube reactors with different numbers and shapes of inner wall Protuberances are investigated in this paper. The micro-reactor with one rectangular protuberance (six different sizes) was studied firstly, and it is shown that reactions near the protuberance are mainly controlled by diffusion, which has little effect on the outlet temperature and methane conversion rate. The formation of cavities and recirculation zones in the vicinity of Protuberances leads to a significant increase of the Arrhenius reaction rate of CH 4 and gas velocity. Next, among the six different simulated conditions (0–5 rectangular Protuberances), the micro-tube reactor with five rectangular Protuberances shows the highest methane conversion rate. Finally, the effect of protuberance shape on methane/moist air catalytic combustion is confirmed, and it is found that the protuberance shape has a greater influence on methane conversion rate than the number of Protuberances. The methane conversion rate in the micro-tube decreases progressively in the following order: five triangular slight Protuberances > five rectangular Protuberances > five trapezoidal Protuberances > smooth tube. In all tests of methane/moist air combustion conditions, the micro-tube with five triangular Protuberances has the peak efficiency and is therefore recommended for high efficiency reactors.
Ruirui Wang - One of the best experts on this subject based on the ideXlab platform.
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The Influence of Slight Protuberances in a Micro-Tube Reactor on Methane/Moist Air Catalytic Combustion
Energies, 2016Co-Authors: Ruirui Wang, Xuesen Du, Wenjie QiAbstract:The combustion characteristics of methane/moist air in micro-tube reactors with different numbers and shapes of inner wall Protuberances are investigated in this paper. The micro-reactor with one rectangular protuberance (six different sizes) was studied firstly, and it is shown that reactions near the protuberance are mainly controlled by diffusion, which has little effect on the outlet temperature and methane conversion rate. The formation of cavities and recirculation zones in the vicinity of Protuberances leads to a significant increase of the Arrhenius reaction rate of CH 4 and gas velocity. Next, among the six different simulated conditions (0–5 rectangular Protuberances), the micro-tube reactor with five rectangular Protuberances shows the highest methane conversion rate. Finally, the effect of protuberance shape on methane/moist air catalytic combustion is confirmed, and it is found that the protuberance shape has a greater influence on methane conversion rate than the number of Protuberances. The methane conversion rate in the micro-tube decreases progressively in the following order: five triangular slight Protuberances > five rectangular Protuberances > five trapezoidal Protuberances > smooth tube. In all tests of methane/moist air combustion conditions, the micro-tube with five triangular Protuberances has the peak efficiency and is therefore recommended for high efficiency reactors.
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the influence of slight Protuberances in a micro tube reactor on methane moist air catalytic combustion
Energies, 2016Co-Authors: Ruirui Wang, Xuesen Du, Wenjie QiAbstract:The combustion characteristics of methane/moist air in micro-tube reactors with different numbers and shapes of inner wall Protuberances are investigated in this paper. The micro-reactor with one rectangular protuberance (six different sizes) was studied firstly, and it is shown that reactions near the protuberance are mainly controlled by diffusion, which has little effect on the outlet temperature and methane conversion rate. The formation of cavities and recirculation zones in the vicinity of Protuberances leads to a significant increase of the Arrhenius reaction rate of CH 4 and gas velocity. Next, among the six different simulated conditions (0–5 rectangular Protuberances), the micro-tube reactor with five rectangular Protuberances shows the highest methane conversion rate. Finally, the effect of protuberance shape on methane/moist air catalytic combustion is confirmed, and it is found that the protuberance shape has a greater influence on methane conversion rate than the number of Protuberances. The methane conversion rate in the micro-tube decreases progressively in the following order: five triangular slight Protuberances > five rectangular Protuberances > five trapezoidal Protuberances > smooth tube. In all tests of methane/moist air combustion conditions, the micro-tube with five triangular Protuberances has the peak efficiency and is therefore recommended for high efficiency reactors.
Xuesen Du - One of the best experts on this subject based on the ideXlab platform.
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The Influence of Slight Protuberances in a Micro-Tube Reactor on Methane/Moist Air Catalytic Combustion
Energies, 2016Co-Authors: Ruirui Wang, Xuesen Du, Wenjie QiAbstract:The combustion characteristics of methane/moist air in micro-tube reactors with different numbers and shapes of inner wall Protuberances are investigated in this paper. The micro-reactor with one rectangular protuberance (six different sizes) was studied firstly, and it is shown that reactions near the protuberance are mainly controlled by diffusion, which has little effect on the outlet temperature and methane conversion rate. The formation of cavities and recirculation zones in the vicinity of Protuberances leads to a significant increase of the Arrhenius reaction rate of CH 4 and gas velocity. Next, among the six different simulated conditions (0–5 rectangular Protuberances), the micro-tube reactor with five rectangular Protuberances shows the highest methane conversion rate. Finally, the effect of protuberance shape on methane/moist air catalytic combustion is confirmed, and it is found that the protuberance shape has a greater influence on methane conversion rate than the number of Protuberances. The methane conversion rate in the micro-tube decreases progressively in the following order: five triangular slight Protuberances > five rectangular Protuberances > five trapezoidal Protuberances > smooth tube. In all tests of methane/moist air combustion conditions, the micro-tube with five triangular Protuberances has the peak efficiency and is therefore recommended for high efficiency reactors.
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the influence of slight Protuberances in a micro tube reactor on methane moist air catalytic combustion
Energies, 2016Co-Authors: Ruirui Wang, Xuesen Du, Wenjie QiAbstract:The combustion characteristics of methane/moist air in micro-tube reactors with different numbers and shapes of inner wall Protuberances are investigated in this paper. The micro-reactor with one rectangular protuberance (six different sizes) was studied firstly, and it is shown that reactions near the protuberance are mainly controlled by diffusion, which has little effect on the outlet temperature and methane conversion rate. The formation of cavities and recirculation zones in the vicinity of Protuberances leads to a significant increase of the Arrhenius reaction rate of CH 4 and gas velocity. Next, among the six different simulated conditions (0–5 rectangular Protuberances), the micro-tube reactor with five rectangular Protuberances shows the highest methane conversion rate. Finally, the effect of protuberance shape on methane/moist air catalytic combustion is confirmed, and it is found that the protuberance shape has a greater influence on methane conversion rate than the number of Protuberances. The methane conversion rate in the micro-tube decreases progressively in the following order: five triangular slight Protuberances > five rectangular Protuberances > five trapezoidal Protuberances > smooth tube. In all tests of methane/moist air combustion conditions, the micro-tube with five triangular Protuberances has the peak efficiency and is therefore recommended for high efficiency reactors.
David I. Wilson - One of the best experts on this subject based on the ideXlab platform.
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Influence of the dimensions of spheroniser plate Protuberances on the production of pellets by extrusion-spheronisation
Advanced Powder Technology, 2018Co-Authors: X.k. Li, David I. Wilson, Yang ZhangAbstract:Abstract The influence of the dimensions of square-patterned pyramidal Protuberances on a spheronisation plate on pellet yield, size and shape distributions, surface tensile strength and surface morphology was investigated using a 45 wt% microcrystalline cellulose/water paste. Tests were conducted using four extrudate diameters (1.0, 1.5, 2.0 and 2.5 mm) generated by screen extrusion and seven plate geometries, including a flat plate as a control. Geometrical analyses of the protuberance shapes provide some insight into the observed differences. Sharper Protuberances reduced yield (promoting breakage and attrition) but tended to give narrower size distributions and less even pellet surfaces. The pellet yield for 1 mm extrudates was also subject to losses caused by fragments passing through the 1.0 mm gap between the plate and the spheroniser wall. Pellet tensile strengths were noticeably greater for 1.0 mm diameter extrudates, which is attributed to the greater extensional strain imparted on the paste during the extrusion step. For some geometries there is an optimal ratio of extrudate to protuberance dimensions.
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Influence of plate surface protuberance size and shape on the production of pellets by extrusion-spheronisation
Chemical Engineering Research & Design, 2016Co-Authors: Yanzhong Li, Jianfeng Xing, S L Rough, David I. WilsonAbstract:Abstract The influence of spheroniser plate surface protuberance geometry on pellets produced from spheronisation of paste extrudates was investigated using a model paste material (45 wt% microcrystalline cellulose/water). Four cross-hatched pattern plates of different dimensions and/or shape of the surface Protuberances were studied in terms of their effect on pellet water content, spheronisation yield, pellet size and shape distributions, and surface morphology. In addition, the effect of the relative size of extrudates to Protuberances was investigated by comparing pellets generated from 1 and 2 mm diameter extrudates. In this study, all the plates have the same groove line arrangement but differ in surface protuberance dimensions and/or shape, and so the focus differs from that of Michie et al. (2012) who investigated plates of different groove line arrangement. For all pellets the water content decreased with spheronisation time, more so for samples made from 2 mm extrudates. A systematic effect of protuberance geometry on the product yield (a measure of losses due to fines) was evident for both extrudate sizes, with yields decreasing in the order (large studs), (pyramidal), (saw-toothed), and (small studs). Analysis of two-dimensional images of dried pellets indicated that the 2 mm diameter extrudates generated pellets with narrower size distributions and better shape quality parameters (aspect ratio and circularity). This was confirmed via SEM images showing the surface morphology. The results indicate that the size of extrudates relative to the plate features is important and should be investigated further.
Wilson Ian - One of the best experts on this subject based on the ideXlab platform.
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Influence of the dimensions of spheroniser plate Protuberances on the production of pellets by extrusion-spheronisation
'Organisation for Economic Co-Operation and Development (OECD)', 2018Co-Authors: Zhang M, Wilson Ian, Tt Yao, Yy ZhangAbstract:This study systematically investigated the influence of the dimensions of square-patterned pyramidal Protuberances on a spheronisation plate on pellet yield, size and shape distributions, surface tensile strength and surface morphology was investigated using a 45 wt% microcrystalline cellulose/ water paste. Tests were conducted using four different extrudate diameters (1.0, 1.5, 2.0 and 2.5 mm) generated by screen extrusion and seven plate geometries, including a flat plate as a control, allowing the relative size of extrudate to protuberance feature to be studied. Geometrical analyses of the protuberance shapes provide some insight into the observed differences, with protuberance angle being significant in many cases. Sharper Protuberances reduced yield (promoting breakage and attrition) but tended to give narrower size distributions and more uneven pellet surface. Pellet yield for 1 mm extrudates was also subject to losses caused by fragments passing through the 1.0 mm gap between the plate and spheroniser wall. Pellet tensile strength was noticeably greater for 1.0 mm diameter extrudates, which is attributed to the greater extensional strain imparted on the paste during the extrusion step. For some geometries there is an optimal ratio of extrudate to protuberance dimensions
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Influence of plate surface protuberance size and shape on the production of pellets by extrusion - spheronisation
Chemical Engineering Research and Design, 2016Co-Authors: Zhang M, Rough Sarah, Li Y, Jf Xing, Wilson IanAbstract:The influence of spheroniser plate surface protuberance geometry on pellets produced from spheronisation of paste extrudates was investigated using a model paste material (45 wt% microcrystalline cellulose/water). Four cross-hatched pattern plates of different dimensions and/or shape of the surface Protuberances were studied in terms of their effect on pellet water content, spheronisation yield, pellet size and shape distributions, and surface morphology. In addition, the effect of the relative size of extrudates to Protuberances was investigated by comparing pellets generated from 1 and 2 mm diameter extrudates. In this study, all the plates have the same groove line arrangement but differ in surface protuberance dimensions and/or shape, and so the focus differs from that of Michie et al. (2012) who investigated plates of different groove line arrangement.This work was finically supported by the China Postdoctoral Science Foundation (Grant No.: 2014M550497).This is the author accepted manuscript. It is currently embargoed pending publication
