共查询到19条相似文献,搜索用时 62 毫秒
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煤粉气流在交变电磁场与高温壁面协同作用下着火过程的机理研究 总被引:1,自引:0,他引:1
详细研究了在感应式无油直接点火燃烧器点火室中 ,煤粉气流在着火过程中的机理。研究表明 :煤粉气流在感应式加热无油直接点火器中的着火过程 ,是交变电磁场与高温壁面加热协同作用的结果。交变电磁场是针对煤粉气流在着火过程中有关特征发生变化 :煤粉颗粒的半导电性 ;挥发分及中间产物的极性、分子的电负性 ;大量存在的、特别是燃烧产物中的各种带电离子。煤粉气流在感应式加热无油直接点火器着火过程中所表现出的特征 ,表明它是一种很有发展前景的点火方式 相似文献
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<正> 阜新矿务局新邱露天矿在10台蒸汽机车锅炉上使用含膦复方硅酸盐被膜水处理剂,防垢、去垢效果较好。通过近一年的使用观察,该水处理剂能起到减缓水垢结生速度,去掉老水垢的作用,是一种高效、廉价的防、去垢剂。现将使用 相似文献
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为了防止重油催化余热锅炉腐蚀和减少锅炉结垢,作为锅外水处理的补充,常对锅炉水质进行补充性锅内加药处理。经对重催锅炉的运行调研发现,锅炉水处理之前常出现炉管泄漏和汽轮机因结晶结垢而停车的现象。分析表明,溶解氧含量高是锅炉系统水侧腐蚀的主要原因;重催锅炉过热蒸汽中夹带Na+和SiO2是造成汽轮机结晶结垢的主要原因。锅炉水处理工业试验效果表明,重催锅炉系统加药前除氧水的溶解氧含量较高(40~50μg/L),加药后已稳定在15μg/L;加药前后汽包的锅炉水pH值变化不大;加药前蒸汽中的Na+、SiO2含量较高,加药后呈下降趋势(小于20μg/L)。锅炉水处理药剂的应用提高了锅炉水浓缩倍数,减少了排污,节约了大量蒸汽。以余热锅炉进水量200t/h计。扣除使用药剂的成本后,一年可节约污水处理费331万元;因增产过热蒸汽,还可增加经济效益1356万元。 相似文献
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通过对EDTA性质和结构的探讨,提出了如何将其运用到水处理中,以指导锅炉水处理工作。 相似文献
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邵青 《锅炉压力容器安全技术》1997,(1):7-10
水处理中常遇到的一个大难题是结垢的问题,投加阻垢分散剂是目前用得较多的方法。介绍了当前使用后一些阻垢分散剂的作用机理,性质及应用情况。 相似文献
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在利用高炉煤气发电方面,简述汽轮发电机采用微机励磁装置的新技术后,发电运行质量稳定,控制可靠,效果显著。 相似文献
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采用可视化的方法对磁场作用下注有磁性液体的矩形窄通道中气泡的上升运动进行了试验研究,定性分析了磁场对气泡上升速度、轨迹及形状的影响。试验工质采用体积分数6.33%的水基Fe3O4磁性液体,同时对比了水中气泡的上升运动。矩形窄通道的宽度分别为1.32和2.04 mm,磁场为对称横向非均匀磁场,气泡由伸入通道底部的毛细管产生。试验结果表明:气泡在正梯度磁场区域做减速运动,在负梯度磁场区域做加速运动;施加垂直于气泡运动方向的横向磁场有助于增强气泡运动的稳定性,且气泡沿着磁场方向被拉长。 相似文献
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固定磁场对旋转火焰旋转特性影响的研究 总被引:1,自引:1,他引:1
通过对固定磁场作用下旋转火焰动量方程的分析和实验研究,得到不同强度磁场作用下旋转火焰的旋转强度变化的规律性。通过研究可以得到,当磁场的强度大干0.357T时,随着磁场强度的增加.火焰的旋转强度会有所下降;当磁场的强度小于0.357T时,随着磁场强度的增加,火焰的旋转强度会有所增加。 相似文献
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Superconducting magnetic energy storage (SMES) is known to be an excellent high‐efficient energy storage device. This article is focussed on various potential applications of the SMES technology in electrical power and energy systems. SMES device founds various applications, such as in microgrids, plug‐in hybrid electrical vehicles, renewable energy sources that include wind energy and photovoltaic systems, low‐voltage direct current power system, medium‐voltage direct current and alternating current power systems, fuel cell technologies and battery energy storage systems. An extensive bibliography is presented on these applications of SMES. Also, some conclusive remarks in terms of future perspective are presented. Also, the present ongoing developments and constructions are also discussed. This study provides a basic guideline to investigate further technological development and new applications of SMES, and thus benefits the readers, researchers, engineers and academicians who deal with the research works in the area of SMES. Copyright © 2017 John Wiley & Sons, Ltd. 相似文献
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The behaviour of some new alternative refrigerant mixtures such as R‐410A, R‐507, R‐407C, and R‐404A under various conditions of magnetic field are discussed, analysed and presented. The effect of magnetic field on mixture behaviour varies from one mixture to another depending upon the mixture's composition and its boiling point and consequently on the thermophysical properties. Furthermore, the use of magnetic field appears to have a positive influence on the thermal capacities of the condenser and the evaporator depending upon the refrigerant mixture's thermophysical properties. Copyright © 2005 John Wiley & Sons, Ltd. 相似文献
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Nikolai A. Usov Olga N. Serebryakova Elizaveta M. Gubanova 《Nanoscale and Microscale Thermophysical Engineering》2020,24(1):20-28
ABSTRACTThe specific absorption rate of magnetic nanoparticles in a rotating magnetic field has been calculated taking into account both thermal fluctuations of the particle magnetic moments and strong magneto-dipole interactions in nanoparticle clusters with various filling factors. For an assembly of interacting superparamagnetic nanoparticles, the maximal values of the specific absorption rate in a rotating magnetic field are found to be 30–40% greater than that in alternating magnetic field. In addition, for the given filling factor and magnetic field amplitude in rotating magnetic field the nanoparticles in a wider range of diameters can effectively contribute to the energy absorption process. Therefore, the use of rotating magnetic field seems preferable in magnetic nanoparticle hyperthermia. 相似文献
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A novel oxygen-enriched method is presented.Using two opposite magnetic poles of two magnets with certaindistance forms a magnetic space having a field intensity gradient near its borders.When air injected into themagnetic space outflows from the magnetic space via its borders,oxygen molecules in air will experience the in-terception effect of the gradient magnetic field,but nitrogen molecules will outflow without hindrance.Therebythe continuous oxygen enrichment is realized.The results show that the maximum increment of oxygen concen-tration reaches 0.49% at 298 K when the maximum product of magnetic flux density and field intensity gradientis 563T~2/m.The enrichment level is significantly influenced by the gas temperature and the magnetic field.Themaximum increment of oxygen concentration drops to 0.16% when the gas temperature rises to 343 K,and dropsto 0.09% when the maximum product of magnetic flux density and gradient is reduced to 101 T~2/m from 563T~2/m. 相似文献