Abstract Calcination of limestone for lime production was successfully performed in the continuous flow mode on a daily basis in a fluidized bed indirectly heated by concentrated solar radiation. Industrial calcium carbonate feedstock was decomposed at the focus of the CNRS 1 MW solar furnace in a pilot-scale solar reactor operating at an average power of 55 kW. The reactor was a four-stage horizontal fluidized bed, irradiated on a front metallic wall of 1 m long and 0.4 m high. A novel aiming strategy was applied to reduce the hot spots on the irradiated wall. The conversion degree was analyzed as a function of the fluidization conditions (air mass flow rate) and the particle mass flow rate. This latter parameter varied in range (14.5 – 25 kg/h), and the highest conversion degrees were obtained at high fluidization velocity. The best result was obtained for a calcite mass flow rate of 20 kg/h, resulting in a degree of conversion of 95.2%, a BET surface area of the lime of 5.39 m2/g, and 17% and 29% thermochemical and thermal efficiencies of the reactor, respectively. This achievement corresponds to a particle mass flow rate three times higher than the current state of the art for solar calcination of lime.

中文翻译：

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在连续流动多级水平流化床中中试规模的太阳能煅烧

摘要 用于石灰生产的石灰石煅烧在连续流动模式下每天在由集中太阳辐射间接加热的流化床中成功进行。工业碳酸钙原料在 CNRS 1 MW 太阳能炉的焦点处在一个中试规模的太阳能反应堆中分解，平均功率为 55 kW。该反应器是一个四级水平流化床，在 1 m 长和 0.4 m 高的前金属壁上进行辐照。应用了一种新颖的瞄准策略来减少辐照壁上的热点。将转化度分析为流化条件（空气质量流量）和颗粒质量流量的函数。后一个参数在范围内变化 (14.5 – 25 kg/h)，在高流化速度下获得最高转化率。方解石质量流量为 20 kg/h 时获得最佳结果，转化率为 95.2%，石灰的 BET 表面积为 5.39 m2/g，热化学和热效率分别为 17% 和 29%分别为反应器。这一成就对应的颗粒质量流量是目前太阳能煅烧石灰技术水平的三倍。