共查询到20条相似文献,搜索用时 171 毫秒
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流态粒子炉由于具有很强的传热能力,要比普通强制对流辐射的炉子大5~10倍,加热和冷却时间可节省80%以上,其热效率达40%以上;炉温可以达到1500℃,炉温均匀且容易 相似文献
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在流化床中,粒子和炉气发生剧烈的紊流运动,加快了炉内传热和传质过程。流动粒子炉的加热速度快,且可缩短渗碳周期(与渗碳炉相比)30%。本文介绍了这种炉子的设计要点和效果。 相似文献
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一 概述流态粒子电炉是根据流态化原理设计成的一种新型金属热处理加热炉。石墨流态粒子电炉是采用石墨粒子为固体粒子,以空气为流化剂。其加热方式是将电流通过埋在石墨流化床中的电极,使流态化的石墨粒子导电发热来加热粒子本身和工件,是一种内热式的加热炉。 相似文献
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文章介绍美国一家热处理专业公司利用流态粒子炉对工件进行各种热处理的经验。该公司曾在流态粒子炉中对碳钢、合金钢、工具钢、高速钢、不锈钢以至铸铁工作进行渗碳、 相似文献
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分离式热管蒸发段的试验研究 总被引:1,自引:0,他引:1
该文采用加热石英玻璃管和无缝钢管模拟分离式热管的蒸发段。对例题的充液。流和传热特性进行了系统的试验和理论分析。作者着重分析了核态沸腾传热区及飞溅降膜区的换热原理,试验数据回归整理李相应了换热系数无量钢准则关系式,与试验数据吻合较好;同时将这两个关系式分别与大空间沸腾传热及整体式热管蒸发段降膜传热区传热进行了比较,得出了极为有用的结论。 相似文献
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利用层流炉研究玉米秸秆粉末的快速热解特性 总被引:11,自引:2,他引:11
为了研究闪速加热条件下生物质的热解挥发特性,设计了等离子体加热高温层流炉作为实验设备。由于该设备内部的流动特性对于实验结果影响巨大,为此特别设计了一套1:1比例的透明有机玻璃冷态模拟装置,用于观察层流炉的流动状态,为热态实验参数设计提供实践指导。根据冷态研究观察结果,进行了层流炉热态实验。采用灰分示踪法测定了玉米秸秆粉末在800,850,900,950K的热解失重曲线。通过数据处理得到了玉米秸秆粉末在快速加热条件下的热解动力学方程和参数。 相似文献
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流化床部分煤气化影响因素研究 总被引:4,自引:0,他引:4
在流化床部分气化炉上系统研究了流化风量、给煤量、水蒸气量、床层温度、静止床层高度、煤种、催化剂等因素对煤气成分和热值的影响,研究结果表明:流化风量、给煤量、水蒸气量、静止床层高度对煤气成分的影响较为复杂,4者都存在最佳范围;床层温度是影响煤气成分的主要因素,煤气热值与温度成正比;增加床层高度,有利于H2、CO生成和CH4分解;烟煤的煤气中含有的可燃成分(H2、CO、CH4)含量比无烟煤高,优质烟煤比劣质烟煤更适合于气化;Ca、Na、K等碱土金属化合物对煤气化具有催化作用,且Na2CO3和K2CO3的催化能力比CaO强。 相似文献
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《Energy》2001,26(1):101-110
In this study, an attempt has been made to gasify coconut shell in a fluidized and a spouted bed reactor. The effects of the gasification temperature on individual gas components, their yields and heating values for both types of beds have also been studied. The fluidized bed appears slightly superior to the spouted bed both in respect to heating value and gas yield over the temperature range studied. 相似文献
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化工有机废液流化床焚烧处理的结焦结渣问题研究 总被引:1,自引:1,他引:0
化工有机废液流化床焚烧过程中,碱金属盐类在炉膛受热面沉积,造成炉膛的结焦结渣:熔融的碱金属盐类沿炉壁流到床层,在床温条件下形成低熔点共晶体,引起床料的粘结、破坏流化,最终导致床层严重结焦结渣。论述了有机废液流化床焚烧炉结焦结渣的形成机理、影响因索及其抑制措施。 相似文献
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The use of the fluidized bed combustor (FBC) has increased. It began in the 20th century as coal combustion and gasification, which then developed into catalytic reactions. Only recently, the application field has been extended to the incineration of biomass and pre-treated waste, for either power generation or waste disposal. The success of fluidized bed combustion is due to high combustion efficiency, great flexibility when it comes to the heating value of the fuel and reduction in pollutants emitted with the flue gas. 相似文献
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《International Journal of Heat and Mass Transfer》1987,30(3):589-599
The finite-element method has been applied to solve the unsteady-state heat transfer equation for solid particles heated at the surface. The results are given as a series of temperature profiles for these systems and are used to estimate the depth of the heat penetration region in the particles and the heat transfer coefficients between a fluidized bed and an immersed heating surface. From calculations it appears that for the typical conditions of bubbling fluidization, i.e. residence times at the heat transfer surface τ = 0.1 s, this region exceeds many times the one found experimentally. This provides theoretical support for the earlier hypothesis that particles in fluidized beds are separated from the heating surface by an air gap. The close agreement between this result and the experimental values requires the assumption of a gap thickness δ = 01dp. Owing to the long contact times of the particles with the heating surface in the electrostatically charged fluidized bed the particle penetration theory of the heat transfer from the surface has been also verified. The heat transfer coefficients derived from this theory agree with the authors' previous experimental work. On the basis of the results obtained some assumptions concerning a generalization of the heat transfer theories have been formulated. 相似文献