Abstract In this work, a 1D model of an entrained-flow carbonator of a Calcium looping process for cement plants is presented and the results of a sensitivity analysis on the main governing process parameters is discussed. Several design and operating parameters have been investigated through a wide sensitivity analysis, namely: adiabatic vs. cooled reactor, high gas velocity gooseneck reactor vs. low velocity downflow reactor, solid-to-gas ratio, sorbent capacity, reactor inlet temperature and solids recirculation. The effect of these design and process parameters on the CO2 capture efficiency and on Calcium looping process heat consumption is assessed. The results of the calculations showed that with a proper combination of solid-to-gas ratio in the carbonator and sorbent carbonation capacity (e.g. ∼10 kg/Nm3 and ∼20% respectively), carbonator CO2 capture efficiencies of about 80% (i.e. total cement kiln CO2 capture efficiencies higher than 90%) can be obtained in a gooseneck-type carbonator with a length compatible with industrial applications in cement kilns (∼120 to 140 m). Further experimental investigations on this reactor concept, especially about fluid-dynamic behavior and the chemical properties of raw meal as CO2 sorbent, are needed to demonstrate the technical feasibility of the proposed process.

中文翻译：

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钙循环法捕集水泥窑CO 2 的气流碳酸化器一维模型

摘要 在这项工作中，提出了水泥厂钙循环工艺的气流碳酸化器的一维模型，并讨论了主要控制工艺参数的敏感性分析结果。通过广泛的敏感性分析研究了几个设计和操作参数，即：绝热与冷却反应器、高气速鹅颈反应器与低速下流式反应器、固气比、吸附剂容量、反应器入口温度和固体再循环. 评估这些设计和工艺参数对 CO2 捕获效率和钙循环工艺热消耗的影响。计算结果表明，适当组合碳酸化器中的固气比和吸附剂碳酸化能力（例如分别为~10 kg/Nm3 和~20%），碳酸化器 CO2 捕集效率约为 80%（即总水泥窑 CO2 捕集效率高于 90%）在鹅颈型碳酸化器中可以获得，其长度与水泥窑中的工业应用兼容（~120 至 140 m）。需要对该反应器概念进行进一步的实验研究，特别是关于流体动力学行为和生料作为 CO2 吸附剂的化学性质，以证明所提出的工艺的技术可行性。