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RISS 인기검색어
- 검색키워드
- 저자 : Shicheng Dong (검색결과 6 건)
- 무료
- 기관 내 무료
- 유료
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CFD-DEM Simulation for Distribution and Motion Feature of Crystal Particles in Centrifugal Pump
Dong Liu,Cheng Tang,Shicheng Ding,Binhao Fu 한국유체기계학회 2017 International journal of fluid machinery and syste Vol.10 No.4
In consideration of the particle features and behaviors, the Computational Fluid Dynamics (CFD)-Discrete Element Method (DEM) coupled method has been applied to simulate the liquid-solid flows in the centrifugal pump with crystallization phenomenon. The crystal particles tend to distribute more uniformly in the inlet section and enter the impeller along the pressure sides of the blades with a moderate rise in velocity. Particle number density is different at different regions in the impeller passages with the characteristics of small density near suction sides and large density near pressure sides. In addition, large crystal particles are mainly located near the pressure sides and small crystal particles predominantly appear in the region near suction sides. The relative velocity magnitude of flow near the impeller inlet tends to be higher than that of crystal particles, while the velocities of the solid particles are substantially higher than liquid phase at the outlet.
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Co-pyrolysis of paper mill sludge and spend coffee ground using CO<sub>2</sub> as reaction medium
Cho, Dong-Wan,Kwon, Eilhann E.,Kwon, Gihoon,Zhang, Shicheng,Lee, Sang-Ryong,Song, Hocheol Elsevier Science B.V. Amsterdam 2017 Journal of CO₂ utilization Vol.21 No.-
<P><B>Abstract</B></P> <P>Here in this study, co-pyrolysis of paper mill sludge (PMS) and spent coffee ground (SCG) was conducted to mainly recover energy and additionally produce engineered biochar as an adsorbent. More specifically, to enhance the generation of syngas (H<SUB>2</SUB> and CO) through co-pyrolysis of PMS and SCG and modify the physico-chemical properties of biochar, carbon dioxide (CO<SUB>2</SUB>) was used as reaction medium. The CO<SUB>2</SUB> co-feeding impact on co-pyrolysis with various mass ratios of PMS and SCG was also evaluated to explore any catalytic effects arising from CO<SUB>2</SUB> and Fe/Ca species in PMS. The decrease in pyrolytic oil substances was apparent due to the synergistic effects of CO<SUB>2</SUB> and Fe/Ca species. Moreover, the generation of CO was catalytically enhanced in the presence of Fe/Ca species in PMS. Co-pyrolysis in CO<SUB>2</SUB> not only converted the impregnated Fe ions into magnetite (Fe<SUB>3</SUB>O<SUB>4</SUB>), but also created porous biochar. One biochar fabricated at the optimal mass ratio (PMS:SCG=7:3) exhibited the highest adsorption capability toward As(V) due to adequate balancing between the amount of Fe/Ca solid minerals and biochar porosity. As a result, co-pyrolysis using CO<SUB>2</SUB> as reaction medium can be a feasible option for the generation of CO along with production of biochar as a byproduct which can be used in environmental application.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Co-pyrolysis of paper mill sludge and spent coffee ground in CO<SUB>2</SUB> atmosphere. </LI> <LI> Presence of Fe/Ca species in biochar generated from co-pyrolysis. </LI> <LI> Catalytic activity of Fe/Ca species shifting condensable hydrocarbons to syngas. </LI> <LI> Higher porosity of co-pyrolyzed biochar compared to a single waste-derived biochar. </LI> <LI> Good As(V) adsorption capability of co-pyrolyzed biochar. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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CFD-DEM Simulation for Distribution and Motion Feature of Crystal Particles in Centrifugal Pump
Liu, Dong,Tang, Cheng,Ding, Shicheng,Fu, Binhao Korean Society for Fluid machinery 2017 International journal of fluid machinery and syste Vol.10 No.4
In consideration of the particle features and behaviors, the Computational Fluid Dynamics (CFD)-Discrete Element Method (DEM) coupled method has been applied to simulate the liquid-solid flows in the centrifugal pump with crystallization phenomenon. The crystal particles tend to distribute more uniformly in the inlet section and enter the impeller along the pressure sides of the blades with a moderate rise in velocity. Particle number density is different at different regions in the impeller passages with the characteristics of small density near suction sides and large density near pressure sides. In addition, large crystal particles are mainly located near the pressure sides and small crystal particles predominantly appear in the region near suction sides. The relative velocity magnitude of flow near the impeller inlet tends to be higher than that of crystal particles, while the velocities of the solid particles are substantially higher than liquid phase at the outlet.
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Weld Seam Recognition Based On CCD Image Processing
Jintao Yu,Xian Li,Mingli Ding,Shicheng Dong,Junling Li 보안공학연구지원센터 2015 International Journal of Signal Processing, Image Vol.8 No.6
Weld seam recognition is the key technique in visual tracking research. Based on the weld image features, the image preprocessing and the linear feature extraction method of the weld seam recognition are designed. The extended adaptive median filtering method and modified Otsu adaptive threshold selection method for image segmentation are used in the image pre-processing process, to remove the noise and compress the image data. Through comparing with several other edge operators, the Roberts operator is chosen to achieve the goal of detecting the welding edge. Finally, the weld seam information is extracted through Hough transform and a satisfied result can be acquired. The study provides a theoretical support for the following designing of the weld tracking system.
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Cao, Leichang,Yu, Iris K.M.,Cho, Dong-Wan,Wang, Di,Tsang, Daniel C.W.,Zhang, Shicheng,Ding, Shiming,Wang, Linling,Ok, Yong Sik Elsevier 2019 Bioresource technology Vol.273 No.-
<P><B>Abstract</B></P> <P>In this study, red seaweed (<I>Gracilaria lemaneiformis</I>) food waste with high carbohydrate content was valorized into levulinic acid (LA) and algae hydrochar through microwave-assisted low-temperature hydrothermal treatment in dilute acid solution. Various parameters including treatment temperature (160–200 °C), reaction time (1–40 min), acid concentration (0–0.6 M), and biomass-to-liquid ratio (1%–10%, w/v) were examined. The energy efficiency and carbon recovery of the proposed process were investigated. Under the experimental conditions of 5% (w/v) biomass loading, 0.2 M H<SUB>2</SUB>SO<SUB>4,</SUB> 180 °C, and 20 min, the highest levulinic acid yield of 16.3 wt% was produced. The resulting hydrochar showed approximately 45–55% energy yield and higher heating values of 19–25 MJ kg<SUP>−1</SUP>. The energy efficiency of the present study (1.31 × 10<SUP>−6</SUP> g LA/J) was comparable to those of the conventional hydrothermal treatment of lignocellulosic biomass, while the reaction time (20 min) was much shorter with a high carbon recovery (73.3%).</P> <P><B>Highlights</B></P> <P> <UL> <LI> Red seaweed food waste was used as a sustainable feedstock for LA production. </LI> <LI> Microwave-assisted hydrothermal treatment facilitated fast red seaweed conversion. </LI> <LI> High LA yield of 16.3 wt% was obtained from <I>Gracilaria lemaneiformis</I>. </LI> <LI> Algae hydrochar recovered can serve as a potential solid fuel. </LI> <LI> Energy efficiency of 1.31 × 10<SUP>−6</SUP> g LA/J and high carbon recovery of 73.3% were achieved. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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