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Cross effect between temperature and consolidation on the flow behavior of granular materials in thermal energy storage systems
Powder Technology ( IF 5.2 ) Pub Date : 2020-03-01 , DOI: 10.1016/j.powtec.2019.11.125
F.J. Durán-Olivencia , M.J. Espín , J.M. Valverde

Abstract Calcium looping (CaL) process offers a promising option to boost the energy efficiency and dispatchability in concentrated solar power (CSP) plants. Backed by ample experience on lime and cement industry, the CaL integration in CSP plants could be not only a feasible and reliable technology for energy storage but also a low-cost choice based on the abundance and cheap price of limestone (CaCO3). However, to date, there is no deep fundamental understanding about how different conditions through the pipes and in storage silos affect the flowability of the granular medium. This is a critical issue, therefore, concerning the ease with which the granular medium is transported, fluidized or stored. Our present work challenges the status quo on the granular-based energy storage systems in which many central questions about powder dynamics through the circuit have been dodged. To deeply explore and figure out optimal settings, we have investigated the potential side effects that changes in temperature and consolidations can induce in the powder flowability. In so doing, we analyze the variation of the tensile strength of the powder while it is being fluidized in a wide range of temperatures and consolidations. The powder, CaCO3 with a particle size around 50 μm, was chosen to mimic the actual conditions in CaL-CSP pilot plants (currently under development). The results show a severe impact on cohesion when the CaCO3 granular medium is exposed at different temperatures ranging from ambient to 500 °C, and consolidation stresses up to 2 kPa. With cohesion increasing up until an order of magnitude in this range of relatively low consolidations, it is a foregone conclusion that those changes uncover a scenario that has not been brought up so far.

中文翻译:

温度和固结对热能储存系统中颗粒材料流动行为的交叉影响

摘要 钙循环 (CaL) 工艺为提高聚光太阳能 (CSP) 发电厂的能源效率和可调度性提供了一种有前景的选择。凭借在石灰和水泥行业的丰富经验,CSP 工厂中的 CaL 集成不仅是一种可行且可靠的储能技术,而且是基于石灰石 (CaCO3) 丰富且价格低廉的低成本选择。然而,迄今为止,对于通过管道和储存筒仓中的不同条件如何影响颗粒介质的流动性,还没有深入的基本了解。因此,这是关于粒状介质运输、流化或储存的难易程度的关键问题。我们目前的工作挑战了基于颗粒的储能系统的现状,其中许多关于粉末动力学通过电路的核心问题已经被回避了。为了深入探索和找出最佳设置,我们研究了温度和固结变化可能导致粉末流动性的潜在副作用。这样做时,我们分析了粉末在广泛的温度和固结范围内流化时抗拉强度的变化。选择粒径约为 50 μm 的 CaCO3 粉末来模拟 CaL-CSP 中试工厂(目前正在开发)中的实际条件。结果表明,当 CaCO3 颗粒介质暴露在从环境温度到 500 °C 的不同温度和高达 2 kPa 的固结应力下时,内聚力受到严重影响。
更新日期:2020-03-01
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