共查询到20条相似文献，搜索用时 156 毫秒
1.
2.
ＡＭＯＤＩＦＩＥＤＣＲＡＮＫ－ＮＩＣＯＬＳＯＮＳＣＨＥＭＥＦＯＲＴＨＥＩＮＩＴＩＡＬ－ＢＯＵＮＤＡＲＹＶＡＬＵＥＰＲＯＢＬＥＭＯＦＳＵＰＥＲＴＨＥＲＭＡＬＥＬＥＣＴＲＯＮＴＲＡＮＳＰＯＲＴＥＱＵＡＴＩＯＮＳｕｎＺｈｉｚｈｏｎｇ（孙志忠）（Ｄｅｐａｒｔ... 相似文献
3.
4.
ＡＮＡＬＹＳＩＳＯＦＴＨＥＦＩＥＬＤＳＳＣＡＴＴＥＲＥＤＦＲＯＭＡＴＷＯ－ＤＩＭＥＮＳＩＯＮＡＬＣＹＬＩＮＤＥＲＩＬＬＵＭＩＮＡＴＥＤＢＹＡＰＯＩＮＴＳＯＵＲＣＥＣｈｅｎｇＣｈｏｎｇｈｕ（程崇虎）ＺｈａｎｇＷｅｎｘｕｎ（章文勋）（ＳｔａｔｅＫｅｙＬａ... 相似文献
5.
ＡＲＥＬＡＴＩＯＮＡＭＯＮＧＡＳＳＯＣＩＡＴＩＶＥＡＬＧＥＢＲＡＳ，ＢＩＡＬＧＥＢＲＡＳＡＮＤＳＥＭＩＧＲＯＵＰＡＬＧＥＢＲＡＳＬｉＦａｎｇ（李方）（ＤｅｐａｒｔｎｉｅｎｔｏｆＭａｔｈｅｎｉａｔｉｃｓａｎｄＭｅｃｈａｎｉｃｓ）ＡＲＥＬＡＴＩＯＮＡＭＯ... 相似文献
6.
ＩＮＦＬＵＥＮＣＥＭＥＡＳＵＲＥＯＦＰＥＲＴＵＲＢＡＴＩＯＮＡＮＤＶＡＲＩＡＢＬＥＳＩＮＲＥＧＲＥＳＳＩＯＮＭＯＤＥＬＳＨｕＹｕｅｑｉｒｉｇ（胡跃清）（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｈｅｍａｔｉｃｓａｎｄＭｅｃｈａｎｉｃｓ）ＩＮＦＬＵＥＮＣＥＭＥＡＳ... 相似文献
7.
8.
ＨＩＧＨＥＲ－ＯＲＤＥＲＳＱＵＥＥＺＩＮＧＦＯＲＴＨＥＳＴＡＴＥＳＧＥＮＥＲＡＴＥＤＢＹＥＸＣＩＴＡＴＩＯＮＳＯＮＡＳＱＵＥＥＺＥＤＶＡＣＵＵＭＳＴＡＴＥＺｈａｎｇＺｈｏｎｇｘｉ，（张中熙）；ＦａｎＨｏｎｇｙｉ（范洪义）（ＤｅｐａｒｔｎｉｅｎｔｏｆＰ... 相似文献
9.
ＬＯＣＡＬＩＮＦＬＵＥＮＣＥＡＮＡＬＹＳＩＳＢＡＳＥＤＯＮＴＨＥＫ－ＬＤＩＳＴＡＮＣＥＡＮＤＴＨＥＩＮＦＯＲＭＡＴＩＯＮＤＩＳＴＡＮＣＥＨｕＹｕｅｑｉｎｇ（胡跃清）（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｈｅｍａｔｉｃｓａｎｄｍｅｃｈａｎｉｃｓ）ＬＯＣＡＬＩ... 相似文献
10.
11.
It has been shown that much dynamic information is hidden in the pressure fluctuation signals of a gas-solid fluidized bed.
Unfortunately, due to the random and capricious nature of this signal, it is hard to realize reliable analysis using traditional
signal processing methods such as statistical analysis or spectral analysis, which is done in Fourier domain. Information
in different frequency band can be extracted by using wavelet analysis. On the evidence of the composition of the pressure
fluctuation signals, energy of low frequency (ELF) is proposed to show the transition of fluidized regimes from bubbling fluidization
to turbulent fluidization. Plots are presented to describe the fluidized bed's evolution to help identify the state of different
flow regimes and provide a characteristic curve to identify the fluidized status effectively and reliably.
Project (No. 60075003) supported by the National Natural Science Foundation of China. 相似文献
12.
Heat transfer between gas-solid multiphase flow and tubes occurs in many industry processes, such as circulating fluidized
bed process, pneumatic conveying process, chemical process, drying process, etc. This paper focuses on the influence of the
presence of particles on the heat transfer between a tube and gas-solid suspension. The presence of particles causes positive
enhancement of heat transfer in the case of high solid loading ratio, but heat transfer reduction has been found for in the
case of very low solid loading ratio (M
s of less than 0.05 kg/kg). A useful correlation incorporating solid loading ratio, particle size and flow Reynolds number
was derived from experimental data. In addition, thek-∈ two-equation model and the Fluctuation-Spectrum-Random-Trajectory Model (FSRT Model) are used to simulate the flow field
and heat transfer of the gasphase and the solid-phase, respectively. Through coupling of the two phases the model can predict
the local and total heat transfer characteristics of tube in gas-solid cross flow. For the total heat transfer enhancement
due to particles loading the model predictions agreed well with experimental data.
Project supported by National Natural Science Foundation for Distinguished Young Scholars (No. 50025618) 相似文献
13.
Cong-jing REN Jing-dai WANG Di SONG Bin-bo JIANG Zu-wei LIAO Yong-rong YANG 《浙江大学学报(A卷英文版)》2011,12(4):260-267
Particle size distribution (PSD) is an important parameter in the process of fluidization, and it always plays a crucial role
in a gas-solid fluidized system. A PSD model for on-line PSD determination based on acoustic emission (AE) measurement was
developed according to the mechanism of particle collision with the inner wall of the cylinder and multi-scale wavelet decomposition
analysis. This PSD model illuminates the quantitative relationship between the energy percentage of AE signals for different
scales and the PSD, which indicates the feasibility of the application of the PSD model. Experiments were undertaken both
in lab and plant gas-solid fluidized setup with polyethylene particles, and the parameters of the PSD model were calibrated
and revised. The experimental conditions and results proved that the PSD model was suitable for on-line measurement and was
sufficiently sensible and accurate. Concerning agglomeration, the PSD model also showed exact serviceability on detecting
the onset of agglomeration by abnormal PSD, and the result agreed with that from the radiation method. Ultimately, AE measurement
was found to be a reliable and credible means for understanding the PSD information that affects the behavior of a system,
which can provide valuable guidance for practical applications. 相似文献
14.
提出了一种基于坐标测量机、测头回转体和激光三角法测头的非接触三维测量系统 ,并介绍了测量系统的工作原理 .同时给出了采用标准球对测量系统进行标定的方法 ,建立了测量系统的数学模型 ,还对白纸样板曲面进行了实际测量 相似文献
15.
Xue-cheng Wu Qin-hui Wang Chen Tian Zhong-yang Luo Meng-xiang Fang Ke-fa Cen 《浙江大学学报(A卷英文版)》2008,9(7):922-931
Particle rotation plays an important role in gas-solid flows. This paper presents an experimental investigation on the spatial distribution of average rotation speed for glass beads in the upper dilute zone of a cold circulating fluidized bed （CFB） riser. It is shown that in the horizontal direction, the average rotation speed in the near-wall area is larger than that in the center area, while in the vertical direction, it decreases as the height increases. The reason resulting in this distribution is analyzed by considering several factors including particle size, particle shape, particle number density, particle collision behavior, and the surrounding flow field, etc. The effects of CFB operation conditions on the spatial distribution of average rotation speed are also studied. The results show that the increasing superficial gas velocity increases the average rotation speed of particles in the near wall area but takes nearly no effect on that in the center area. The external solids mass flux, however, takes the opposite effect. It is found that the average rotation speeds of particles in both areas are increased as the total amount of bed material increases. 相似文献
16.
A mechanical separation process was developed for recovering metals from printed circuit board （PCB） scrap; it included three steps： impact crushing, sieving and fluidization separation. The mechanism of the technique was based on the difference in the crushabilities of metallic and nonmetallic materials in the PCBs that led to the concentrated distribution of metals in particles of larger sizes and nonmetals mostly in particles of smaller sizes. It was found that crushed PCB particles from 0.125 mm to 1.000 mm contained about 80% of metals in the PCBs. Metals acquired satisfactory liberation in particles smaller than 0.800 mm. The crushed PCB particles were sieved into fractions of different size ranges. Each fraction separately went through a gas-solid fluidized bed operating at a selected optimal gas velocity for the specific size range. Approximately 95% of metals in printed circuit board particles from 0.125 mm to 0.800 mm was recovered by the gas-fluidized bed separator at the selected optimal gas velocity. However, separation of metals from particles smaller than 0.125 mm was not satisfactory. Further study is needed on metal recovery from fine particles. 相似文献
17.
随着全球化进程的不断加深以及国际文化交流的日益频繁,我国的媒体面临的挑战越来越严峻,地方电视台也无可避免地被卷入了这个浪潮之中。在这个机遇与挑战并存的大环境中,地方电视台应该组建广电集团、进行生产整合,实施频道专业化、注重栏目精品化,提高节目质量、树立品牌意识,开拓受众市场、扩大社会影响,以此规避风险、发展自身。 相似文献
18.
本文对探针法测定TIG电弧的电流密度进行了研究,并在此基础上分析了电流密度的径向分布的数学表达式。 相似文献
19.
城市污水生物脱氮工艺研究 总被引：1，自引：0，他引：1
我国是一个干旱、严重缺水的国家,随着城市化率的不断提高,污水量大幅度增加,自然水体富营养化日趋严重,符合标准的可供水源急剧减少,水资源短缺已成为制约我国社会经济发展的瓶颈,降低排水中氮的含量是控制水体富营养化的关键,本文全面总结了城市污水生物脱氮工艺研究现状,并分析了目前生物脱氮工艺存在的问题及生物流化床工艺的特点,指出生物流化床技术是值得深入研究的、高效节能的废水处理方法。 相似文献
20.
ＨｅａｔＴｒａｎｓｆｅｒＭｅｔｈｏｄｆｏｒＳｏｌｉｄＦｌｏｗＲａｔｅＭｅａｓｕｒｅｍｅｎｔｉｎＧａｓＳｏｌｉｄＴｗｏＰｈａｓｅＦｌｏｗＹｕａｎＺｈｕｌｉｎ（袁竹林）ＬｕＺｕｏｊｉ（卢作基）（ＴｈｅｒｍｏｅｎｅｒｇｙＥｎｇｉｎｅｅｒｉｎｇＲｅｓｅａｒ... 相似文献