Papers by Keyword: Agglomeration

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Authors: Juan Liu, Hui Huang, Xi Peng Xu
Abstract: In this paper, the influences of abrasive size, abrasive concentration and admixture way on the abrasive dispersing of the sintered ultra-fine diamond tool were systemically investigated. Then, a comparison of the abrasive dispersing was made between the sintered ultra-fine diamond tool and the newly developed ultra-fine diamond tool by gel technique. ESEM was applied to observe the abrasive dispersing of the sintered and gel-coupled ultra-fine diamond tools. The abrasive dispersing was quantitatively evaluated by the statistic laws of grit spacing in a certain area. Experimental results indicated that the dispersing was mainly influenced by the abrasive size. The ultra-fine abrasive tended to agglomerate with the decrease of grit sizes due to the increase of surface energies. The abrasive concentration and admixture way had few effects on abrasive dispersing. The abrasive dispersing of the sintered diamond tool was worse compared with the gel-coupled ultra-fine diamond tool.
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Authors: Fan Xu, Yu Tang, Ou Hao
Abstract: This article expound that, piece of historical buildings which witness urban developmental venation are facing the questions in nowadays urban development, although historical buildings embody corporality, but they contain spirit speciality, they regard something according with the trend of social development as the gist, put forward that historical buildings’ criterion and form to be reserved. Of course it is important to reserve the historical buildings, but it is not the only way to reserve them, the deep-seated meanings to reserve is in order to continue, so it is the key and soul to continue the connotation of piece of historical buildings. This article expound with example that there are two side in continuing content, those are physical layer and psychic layer, and the form to continue which is look for the jumping-off point of continuing from history, by this way we can obtain logistic extend in physical layer. This is an open system, this article summarize several sides about it and to prove them with example, and to exploit point of view and manner of thinking in urban construction and development.
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Authors: Zi Li Liu, Qian Wen Dai, Sheng Zhou Chen, Zhe Guo
Abstract: Antimony doped tin oxide (ATO) nanoparticles were synthesized via complex-homogeneous coprecipitation. Then different drying methods (such as azeotropic distillation, infrared drying and microwave drying, etc.) were used to eliminate the agglomeration. The nanoparticles were characterized by thermal analysis, X-ray diffraction (XRD), and Brunauer-Emmett-Teller measurements (BET). The result shows that ATO nanopaticles with tetragonal rutile phase structure are all well crystallized after the drying processes above, and the average grain size is between 29.30 nm and 71.52 nm. The grain size estimated by BET method is similar to the result of Scherrer equation, and the nanoparticles prepared by azeotropic distillation have better crystallinity comparing to other methods. With the extension of the distillation time, the grain size increases, and the colour changes from grey blue to light grey. Moreover, the combination of azeotropic distillation and infrared drying can prepare smaller and better crystalline ATO nanoparticles.
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Authors: Yang Xiao, Zhen Zhang, Wei Hua Pu
Abstract: In order to control the FePO4 particles size, the reaction precipitation between Fe (NO3)3 and H3PO4 was performed by the controlled crystallization technique. The influences of the feed concentration, stirring speed and reaction temperature on the agglomeration size of FePO4 were investigated. The particles produced were amorphous and can be crystallied to pure phase FePO4 after calcining at 550 °C for 5 hours. The agglomerates size and morphology were characterized by the laser granulometer and scanning electron microscope, respectively. The results showed that the products were spherical and the agglomerate size was in the range of 2~9 μm at the solution PH 2.30 and the other experiment conditions were as follows, the reactant concentration was ranged from 0.5 to 1.0mol/L, stirring speed from 500 to 3000 rpm and reaction temperature from 15 to 80°C. It was found that the agglomerates size increased with the increase of the reaction temperature, decreased with the increase of the feed concentration and stirring speed. Based on the discretized population balance, the particle size distribution model was developed. There was a good agreement between the calculated values and the experimental data, which indicated that this model can be used for predicting the agglomerates size distribution at any desired levels of the variables studied.
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Authors: Marian Peciar, Roman Fekete, Peter Peciar
Abstract: This article deals with the presentation of modern applications for processing powdered, primarily hazardous, waste to an agglomeration form appropriate for subsequent processing by classical methods, for example in the construction, automotive and consumer goods industries. The aim of the research work was to set appropriate operating conditions in order to appreciate currently non-processable wastes resulting from the intensive production of often extremely expensive materials. Technologies which enable returning powder waste back into the primary production cycle were developed and experimentally tested, thus saving raw material resources. When necessary for the fixing of fine airborne particles with a problematic compacting curve (hard to compress, repulsive due to the surface charge) extrusion processes using a patented technology enabling controlled modification of shear forces in the extrusion zone were successfully applied. A new type of axial extruder allows the elimination of the liquid phase and as a result prevents the clogging of the extrusion chamber. In the case of need for granulation of sensitive materials (for example pharmaceuticals not allowing the addition of any kind of agglomerating fluid or reacting strongly in the contact of the two phases), a process of compaction between rolls with different profiled surface was successfully applied. The developed high technologies and the resulting products thus represent a major contribution to environmental protection in the context of not only the work but also the communal environment.
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Authors: Meng Guo, Wei Guo Lin, Hai Yan Wu, Zhong Zhao, Jin Wei Liu
Abstract: The occurrence of agglomeration in gas-solid fluidized bed can have a very negative impact on the efficiency of reactor operation. In order to overcome the agglomeration problem, an Agglomeration Early-Warning System (AEWS) is proposed. AEWS is able to detect the event of such undesired behavior and make it possible to operate more efficiently. The sensitivity and selectivity of AEWS is illustrated with experimental results. In order to minimize the false alarm, both moving time window method and minimizing value method were analyzed. The experimental results have shown that agglomeration can be recognized 30-60min earlier with AEWS than that with conventional methods based on changes in pressure drop or temperature difference over the bed.
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Authors: Fei Li, Fu Zhou Luo, Zhi Liu, Yan Cheng Li
Abstract: Under the new energy industry is in Yulin City, "Twelfth Five-Year Plan" is another major issue, with social progress, increasingly rapid industrial development, environmental pollution is also an upward trend in the case, as the country's coal market - Yulin undoubtedly fog and haze is often a matter, therefore, the development of new energy is undoubtedly sustain the environment, the economy, a link between people's livelihood and industrial development. The article by using qualitative methods - location quotient and quantitative methods-CES measure method to measure the energy of Yulin City, the new clustering analysis of the new energy industry cluster Yulin growing trend, to be developed into the next Yulin advantages of industrial clusters.
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Authors: Zhi Xia Jiang, Wen Dan Zhang, Yan Zhong Li
Abstract: Through nation-wide and various provinces and regions of the country's gross national product and software industry data Investigation. Combined with industrial concentration index method and location entropy method on the cluster development of software industry and software industry in Jilin province has carried on the empirical research, analysis the software industry in Jilin province while keeping the sustainable development. But the agglomeration development is weak. The software business income, agglomeration degree and the speed of converging in the software industry are below the national average.
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Authors: Ying Zhao, Gui Shi Cheng
Abstract: Experiments were carried out to investigate the characteristic of kaolin on agglomeration mechanism of the black liquor combusted in a bench-scale fluidized bed. The combustion experiments were focused on the influence of different operating conditions at three temperatures (700°C, 750°C and 800°C), and at three kaolin additive dosages(0, 10% and 30%). Sinter of the bed material collected after experiments were analysed by scanning electron microscope (SEM) and X-ray diffractometry (XRD). The results show that kaolin is a significant additive in improving the black liquor combustion in a fluidized bed. With the kaolin dosage increases, the degree of agglomeration decreases.
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Authors: Yi Hung Liu, Shuji Matsusaka
Abstract: The characteristics of dry ice particles produced by expanding liquid carbon dioxide and its application for surface cleaning have been studied experimentally. The production of the dry ice particles was based on the Joule-Thomson effect. The ejected dry ice particles were observed using a high-speed microscope camera. Through digital image processing, the particle size and particle velocity in the jet were analyzed. To in-situ measure the size distribution of the dry ice particles, a laser diffraction method was used. The experimental results showed that the primary dry ice particles ejected from the expansion nozzle were about 1 μm in mass median diameter. The presence of a thermally insulated tube at the outlet of the nozzle enhanced the agglomeration of the particles, whereby agglomerates of about 100 μm in mass median diameter were formed. The performance of dry ice jet for removing fine particles adhering to surfaces was also evaluated using microscopic observation. It was found that the particle removal process consists of two stagesslow removal stage and rapid removal stagethat are related to the jet temperature.
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