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Cycle Development and Design for CO_2 Capture from Flue Gas by Vacuum Swing Adsorption

机译：真空摆动吸附法从烟气中捕集CO_2的循环开发与设计

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摘要

CO_2 capture and storage is an important component in the development of clean power generation processes. One CO_2 capture technology is gas-phase adsorption, specifically pressure (or vacuum) swing adsorption. The complexity of these processes makes evaluation and assessment of new adsorbents difficult and time-consuming. In this study, we have developed a simple model specifically targeted at CO_2 capture by pressure swing adsorption and validated our model by comparison with data from a fully instrumented pilot-scale pressure swing adsorption process. The model captures non-isothermal effects as well as nonlinear adsorption and nitrogen coadsorption. Using the model and our apparatus, we have designed and studied a large number of cycles for CO_2 capture. We demonstrate that by careful management of adsorption fronts and assembly of cycles based on understanding of the roles of individual steps, we are able to quickly assess the effect of adsorbents and process parameters on capture performance and identify optimal operating regimes and cycles. We recommend this approach in contrast to exhaustive parametric studies which tend to depend on specifics of the chosen cycle and adsorbent. We show that appropriate combinations of process steps can yield excellent process performance and demonstrate how the pressure drop, and heat loss, etc. affect process performance through their effect on adsorption fronts and profiles. Finally, cyclic temperature profiles along the adsorption column can be readily used to infer concentration profiles-this has proved to be a very useful tool in cyclic function definition. Our research reveals excellent promise for the application of pressure/vacuum swing adsorption technology in the arena of CO_2 capture from flue gases.
机译：CO_2的捕获和储存是清洁发电过程开发中的重要组成部分。一种CO_2捕集技术是气相吸附，特别是变压吸附（或真空吸附）。这些过程的复杂性使得对新吸附剂的评估和评估既困难又费时。在这项研究中，我们开发了一个专门针对变压吸附法捕获CO_2的简单模型，并通过与完全仪器化的中试变压吸附过程中的数据进行比较，验证了我们的模型。该模型捕获了非等温效应以及非线性吸附和氮共吸附。使用该模型和我们的设备，我们设计并研究了许多捕获CO_2的循环。我们证明，通过基于对各个步骤的作用的理解，通过精心管理吸附前沿和循环的组装，我们能够快速评估吸附剂和工艺参数对捕集性能的影响，并确定最佳的操作方式和循环。与穷举参数研究相反，我们建议采用这种方法，穷举参数研究往往取决于所选循环和吸附剂的具体情况。我们显示出适当的工艺步骤组合可以产生出色的工艺性能，并展示出压降和热量损失等如何通过其对吸附前沿和轮廓的影响而影响工艺性能。最后，沿着吸附塔的循环温度曲线可以很容易地用来推断浓度曲线-这已被证明是定义循环函数的非常有用的工具。我们的研究表明，压力/真空变压吸附技术在烟气捕获CO_2领域的应用前景广阔。

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  • 来源
    《Environmental Science & Technology》 |2008年第2期|563-569|共页
  • 作者

    JUN ZHANG; PAUL A. WEBLEY;

  • 作者单位
  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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