共查询到20条相似文献,搜索用时 125 毫秒
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一、引言 煤炭是我国的主要能源,今后数十年中我国煤炭的开采和使用量都将大幅度地持续增长.为了有效地利用煤炭资源、保障人类健康和生态平衡,必须开发高效率低污染的燃煤技术.燃煤流化床具有煤种适应性强、可燃用低品位煤等优点,为充分利用煤炭资源开辟了新途径,且流化床中燃烧温度低,NO_x的生成量低,还可用石灰石等在床内脱硫,有效地降低环境污染.它与燃气轮机、蒸汽轮机等组成联合循环,可以显著地 相似文献
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循环流化床内颗粒运动特性 总被引:2,自引:0,他引:2
1前言循环流化床作为一种先进的清洁煤燃烧技术,尤其在脱硫方面具有的独特优越性,使其在电力行业发展迅速。单台容量为250MWe级的循环流化床电站锅炉预计将在1998年运行,同时,国外正着手利用循环流化床燃烧技术改造老式煤粉锅炉。尽管循环流化床技术在工业界取得了很快的发展,但作为技术核心的内部颗粒运动特性还需做进一步的研究,以便为模型计算和装置放大提供更为精确的微观颗粒运动数据。作者为了探求循环床内颗粒运动特性,以求得到对工业发展的有用规律、优化设计及运行操作,利用FFT技术对三千多组颗粒浓度、颗粒速度和颗粒动… 相似文献
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多旋风分离器及返料系统是保证循环流化床锅炉高效燃烧的关键设备,是循环流化床大型化研究的关键部件之一。本文采用电容层析成像技术结合压力测量,对多旋风分离器返料系统内部气固两相流场进行实验研究。通过六旋风分离器冷态循环流化床电容层析成像浓度分布和压力测量,揭示循环流化床多分离返料系统颗粒流动分配特性,为循环流化床锅炉大型化,特别是超临界锅炉多旋风分离器的优化布置提供科学依据,基础实验数据库和技术手段,研究内容将电容层析成像技术的应用扩展到工程设计中,对实际工程起到理论指导的作用。 相似文献
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A schematic cycle is considered, and thermodynamic analysis is performed to substantiate the possibility of creating multipurpose industrial power plants, operating on a trigeneration cycle, based on production-type turbofan engines. 相似文献
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M. Kato H. Sugai T. Hayashi M. Nishi M. Tanase T. Matsuzaki K. Ishida K. Nagamine 《Hyperfine Interactions》2001,138(1-4):397-401
JAERI has been developing an improved compact tritium gas enrichment/recycling system for efficient research and development
work using tritium. A proton conductor has been investigated and a compact enrichment system was designed with a hydrogen
pump employing a proton conductor. The pump can separate hydrogen directly from the helium gas carrier and minimize the size
of the system. A prototype hydrogen pump was developed and its performance test was started.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
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A combinatorial sputter coating system has been developed that can optimize the crystal preferred orientation of coating films. With this system, it is possible to synthesize various kinds of coatings whilst precisely controlling conditions such as the sputter gas, the gas pressure, the gas partial pressure, the r.f. power, the substrate temperature, the distance between the substrate and target, etc. In this way, we successfully synthesized copper oxide coatings with different crystal preferred orientations, and low frictional property was obtained by optimizing the crystal preferred orientation. 相似文献
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本文介绍了一种适合于测量高速气流的聚偏氟乙烯(PVF2)压力传感器,这种传感器适用于测量各种小空间、非平面状样品表面对高速气流的响应。我们还研制了一套能可靠测得聚偏氟乙烯对高速气流响应的触发系统,它具有触发灵敏,使用可靠等优点。利用上述技术已成功地测得了二级轻气炮分流系统的分流效果,研究表明,采用多级分流后能使高速气流对靶的作用减弱90%,并且只需三块分流板即可满足实验要求。 相似文献
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P. Schury G. Bollen M. Block D. J. Morrissey R. Ringle A. Prinke J. Savory S. Schwarz T. Sun 《Hyperfine Interactions》2006,173(1-3):165-170
A linear gas stopping cell has been implemented at the NSCL as part of the Low Energy Beam and Ion Trap (LEBIT) facility.
The gas stopping cell is used to convert relativistic ions into low energy ions suitable for use in ion trap experiments.
A common undesired property of such systems is the production of beam contaminants through charge exchange of gas impurities
with the He + ions produced in the stopping process. These contaminants are of particular concern for Penning trap mass spectrometry, where
the simultaneous trapping of ions with different masses can cause unwanted shifts in the measured cyclotron frequency of the
desired ions. In order to minimize such effects, a multi-stage beam purification system has been implemented at LEBIT. 相似文献
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A system of two-dimensional photon gas has recently been realized experimentally. We show that this setup can be used to observe a universal breathing mode of photon gas and a modification in the experimental setup would open up a possibility of observing the Berezinskii–Kosterlitz–Thouless (BKT) phase transition in such a system. Furthermore, the universal jump in the superfluid density of light in the output channel can be used as an unambiguous signature for the experimental verification of the BKT transition. 相似文献
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F. E. Orlenko S. I. Chelkak E. V. Orlenko G. G. Zegrya 《Journal of Experimental and Theoretical Physics》2010,110(5):805-810
Collective effects of spin ordering in a quasi-one-dimensional degenerate electron gas are discussed. The total energy of
the quasi-one-dimensional system, as well as the exchange contribution per particle, has been calculated by the Hartree-Fock
method. It has been shown that spontaneous polarization can be observed in the system when a universal parameter related to
the density of the particles satisfies the inequality r
s
≥ 0.476. A comparative analysis of one-, two-, and three-dimensional systems has been performed. A general expression has
been obtained for the total energy per particle as a function of the degree of polarization and dimension of the system. According
to this expression, the possibility of spontaneous polarization in the system is closely correlated with the dimension of
the system. 相似文献