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首页> 外文会议>ASME(American Society of Mechanical Engineers) Energy Sustainability Conference; 20070627-30; Long Beach,CA(US) >COMPUTATIONAL FLUID DYNAMICS SIMULATION OF A TUBULAR AEROSOL REACTOR FOR SOLAR THERMAL ZnO DECOMPOSITION
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COMPUTATIONAL FLUID DYNAMICS SIMULATION OF A TUBULAR AEROSOL REACTOR FOR SOLAR THERMAL ZnO DECOMPOSITION

机译：管状ZnO热分解气溶胶反应器的计算流体动力学模拟。

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摘要

Computational fluid dynamics simulations were performed to model solar ZnO dissociation in a tubular aerosol reactor at ultra-high temperatures (1900 K - 2300 K). Reactor aspect ratios ranged between 0.15 and 0.45, with the smallest ratio base case corresponding to a reactor diameter of .02286 m. Gas flowrates were set such that the AnZnO ratio was greater than 3:1 and the system residence time was below 2 s. The system was found to exhibit highly laminar flow in all cases (Re ～ 10), but gas velocity profiles did not seriously affect temperature profiles. Particle heating was nearly instantaneous, a result of the high radiation heat flux from the wall. There was essentially no difference between gas and particle temperatures due to the high surface area for conductive heat exchange between the phases. Calculation of ZnO conversion showed that significant conversions ( > 90%) could be attained for residence times typical of rapid aerosol processing. Particle sizes larger than 1 μm negatively affected conversion, but sizes of 10 μm still gave acceptable conversion levels. Simulation of reaction of product oxygen with the reactor wall showed that a reactor constructed of an oxidation-sensitive material would not be a viable choice for a high temperature solar reactor.
机译：进行了计算流体动力学模拟，以模拟管式气溶胶反应器中在超高温（1900 K-2300 K）下的太阳ZnO解离。反应堆长径比在0.15和0.45之间，基本情况下的最小比率对应于.02286 m的反应堆直径。设置气体流速，以使AnZnO比率大于3：1，系统停留时间小于2 s。发现该系统在所有情况下都表现出高度的层流（Re〜10），但是气体速度曲线并没有严重影响温度曲线。颗粒加热几乎是瞬时的，这是壁发出的高辐射热通量的结果。由于相之间进行传导性热交换的表面积较大，因此气体和颗粒温度之间基本上没有差异。 ZnO转化率的计算表明，对于快速气溶胶加工的典型停留时间，可以获得显着的转化率（> 90％）。大于1μm的粒径会对转化率产生负面影响，但10μm的粒径仍可提供可接受的转化水平。产物氧与反应器壁反应的模拟表明，由氧化敏感材料构成的反应器对于高温太阳能反应器不是可行的选择。

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