Experimental evaluation of a non-isothermal high temperature solar particle receiver
Experimental evaluation of a non-isothermal high temperature solar particle receiver
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DOI：
10.1016/j.energy.2003.07.001
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发表时间：
2004-04-01
期刊：
影响因子：
9
通讯作者：
Kribus, A
中科院分区：
文献类型：
--
作者：
Bertocchi, R;Karni, J;Kribus, A
报道了一种太阳粒子接收器的实验评价。通过吸收辐射的亚微米碳颗粒云，集中的辐射在气流中转化为热能。平均太阳能浓度为2500在一个80毫米直径的光圈。云粒子质量分数在0.2- 0.5%的范围内。出口气体温度超过2100 K，测量与氮气，1900 K与CO2，和2000 K与空气，这是1000 K比以前报道的使用粒子接收器。空气加热试验表明，在2000 K温度下，颗粒/气体的热传递超过了氧/碳的氧化速率。气流中小于0.5%的碳颗粒质量分数确保了加热的空气仅包含可忽略量的CO2和NOx。轴向接收器腔壁温度随着与孔径的距离而增加，在总腔长的60%处达到峰值，然后朝向出射平面略微降低。在稳定的条件下，在气体出口平面的壁温至少100 K的冷却器比气体的，减轻与传统的体积接收器的结构约束。在最高质量流率下，估计的辐射到热能的转换效率超过80%。接收器在1700 K以上的温度下累计超过12个净小时，没有任何重大故障。(C)2003 Elsevier Ltd.保留所有权利。
The experimental evaluation of a solar particle receiver is reported. Concentrated irradiation was converted into thermal energy in a gas flow by a cloud of radiation absorbing sub-micrometre carbon particles. Average solar concentration was 2500 on an 80 mm diameter aperture. Cloud particle mass fractions were in the range of 0.2-0.5%. Exit gas temperatures exceeding 2100 K were measured with nitrogen, 1900 K with CO2, and 2000 K with air, which is 1000 K higher than previously reported using a particle receiver. The air heating tests reveal that the particle/gas heat transfer exceeded the oxygen/ carbon oxidation rate up to 2000 K. A carbon particle mass fraction of less than 0.5% in the gas stream ensures that the heated air contains only a negligible amount Of CO2 and NOchi. The axial receiver cavity wall temperature increased with distance from the aperture, peaking at 60% of the total cavity length, and then slightly decreasing towards the exit plane. At steady conditions, the wall temperatures in the gas exit plane were at least 100 K cooler than the gas's, alleviating structural constraints associated with conventional volumetric receivers. Estimated radiation to thermal energy conversion efficiencies surpassed 80% at the highest mass flow rates. The receiver accumulated over 12 net hours at temperatures above 1700 K without any major failures. (C) 2003 Elsevier Ltd. All rights reserved.