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Prospects of using equilibrium-based column models in dynamic process simulation of post-combustion CO2 capture for coal-fired power plant

机译：燃煤电厂燃烧后CO2捕集动态过程模拟中使用基于平衡的柱模型的前景

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摘要

This paper discusses the limitations and prospects of using equilibrium-based column models for the dynamic simulation of post-combustion CO2 capture processes. Based on their features, one of three available commercial process simulators was chosen for this study. A pilot plant configuration adopted from literature was modeled and simulated using this simulator. Simulation results were compared with plant data and with results using standard rate-based models as available in literature. Temperature profiles in columns and overall mass and energy balances were found to be similar to plant data; however, CO2 capture-rate, reboiler-duty, and rich-loading using the model were overestimated. A method of reduced stage efficiencies in the absorber was used, which improved performance prediction further with a maximum deviation of 5%. Further, this dynamic model was used to analyze the process subjected to variation in flue gas flow-rate with a similar trend of futuristic power plants by controlling either liquid to gas ratio or CO2 capture-rate. Controlling liquid to gas ratio provided more control over the reboiler-duty while controlling the capture-rate focused on maintaining a certain capture ratio. The advantages and disadvantages of both methods are discussed and based on that, the controlling capture ratio was found suitable for using while power plant works flexibly with stringent emission regulations. (C) 2017 Elsevier Ltd. All rights reserved.
机译：本文讨论了使用基于平衡的色谱柱模型进行燃烧后二氧化碳捕集过程动态模拟的局限性和前景。基于它们的功能，本研究选择了三个可用的商业过程仿真器之一。使用该模拟器对文献中采用的中试工厂配置进行了建模和仿真。仿真结果与工厂数据进行了比较，并与文献中使用基于标准速率的模型进行了比较。发现塔中的温度曲线以及整体质量和能量平衡与工厂数据相似。然而，使用该模型的二氧化碳捕获率，再沸器负荷和浓负荷却被高估了。使用了降低吸收器级效率的方法，该方法进一步改善了性能预测，最大偏差为5％。此外，该动态模型用于通过控制液气比或CO2捕集率来分析烟气流速变化的过程，该趋势具有与未来电厂相似的趋势。控制液气比可以更好地控制再沸器的工作量，而控制捕集率的重点在于保持一定的捕集率。讨论了这两种方法的优缺点，并在此基础上，发现控制捕集率适用于电厂在严格的排放法规下灵活工作的情况。 （C）2017 Elsevier Ltd.保留所有权利。

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  • 来源
    《Fuel》 |2017年第15期|85-97|共13页
  • 作者

    Dutta Rohan; Nord Lars O.; Bolland Olav;

  • 作者单位

    NTNU Norwegian Univ Sci & Technol, Dept Energy & Proc Engn, Trondheim, Norway;

    NTNU Norwegian Univ Sci & Technol, Dept Energy & Proc Engn, Trondheim, Norway;

    NTNU Norwegian Univ Sci & Technol, Dept Energy & Proc Engn, Trondheim, Norway;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Process modeling; CCS; Control structure; MEA; Transient analysis;

    机译：过程建模;CCS;控制结构;MEA;瞬态分析;

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