Abstract The calcium looping process is a high temperature post-combustion CO2 capture technology that is expected to be especially suitable for cement plants. Both processes rely on CaCO3 as common feedstock, enabling the reutilisation of purged calcium looping sorbent in the cement clinker manufacturing process. Thus, setting new boundary conditions for the calcium looping process. So far, calcium looping CO2 capture has been demonstrated at semi industrial scale for fossil fuelled power plants but not yet for cement plants. In this work, results obtained from University of Stuttgart's 200 kW calcium looping pilot plant investigating the so called tail-end calcium looping cement plant integration are presented focusing on the carbonation reactor. Different integration levels between the cement plant and the calcium looping process were assessed investigating make-up ratios up to 0.9 mol mol−1 and CO2 concentrations up to 0.33 m3 m−3. Operation at high sorbent make-up rates or high integration levels enhanced the sorbent's CO2 carrying capacity whereas for low integration levels the sorbent activity converged towards its residual CO2 carrying capacity. For high sorbent make-up flows, CO2 capture was limited by the carbonation equilibrium yielding CO2 capture rates as high as 98% in the carbonator at carbonation temperatures around 600 ∘C, whereas for low integration CO2 capture was limited by the active amount of CaO being fed to the carbonator. The active space time carbonator model was applied with satisfactory agreement to the conducted experiments indicating the model's validity for calcium looping CO2 capture from cement plant. The obtained results emphasise the suitability of calcium looping CO2 capture for the decarbonisation of the cement sector.

中文翻译：

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水泥厂二氧化碳捕集尾端钙循环配置碳酸化反应器的实验研究

摘要 钙循环法是一种高温燃烧后二氧化碳捕集技术，有望特别适用于水泥厂。这两种工艺都依赖 CaCO3 作为普通原料，从而能够在水泥熟料制造过程中重新利用净化的钙循环吸附剂。因此，为钙循环过程设置了新的边界条件。到目前为止，钙循环二氧化碳捕集已经在化石燃料发电厂的半工业规模上得到证明，但尚未在水泥厂中得到证明。在这项工作中，介绍了从斯图加特大学 200 kW 钙循环中试工厂获得的结果，该工厂研究了所谓的尾端钙循环水泥厂集成，重点是碳酸化反应器。评估了水泥厂和钙循环过程之间的不同集成水平，研究了高达 0.9 mol mol-1 的补给比和高达 0.33 m3 m-3 的 CO2 浓度。在高吸附剂补充率或高整合水平下运行提高了吸附剂的 CO2 承载能力，而在低整合水平下，吸附剂活性趋向于其残余 CO2 承载能力。对于高吸附剂补充流量，CO2 捕获受到碳酸化平衡的限制，在大约 600 ∘C 的碳酸化温度下，碳酸化器中的 CO2 捕获率高达 98%，而对于低集成度的 CO2 捕获受到 CaO 活性量的限制被送入碳酸化器。活性时空碳酸化器模型与所进行的实验结果一致，表明该模型' 从水泥厂捕获钙循环 CO2 的有效性。获得的结果强调了钙循环二氧化碳捕集对水泥行业脱碳的适用性。