<br>以分离/净化装置为重点的可再生乙醇生产的节能替代方案：技术经济分析,Energy

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以分离/净化装置为重点的可再生乙醇生产的节能替代方案：技术经济分析
Energy ( IF 9.0 ) Pub Date : 2021-10-20 , DOI: 10.1016/j.energy.2021.122363
Maryam Botshekan ₁ , Ahmad Moheb ₁ , Fatemeh Vatankhah ₁ , Keikhosro Karimi _{1,

2} , Marzieh Shafiei ₂

Affiliation

生物乙醇生产过程包括高能耗、高运营成本的装置，即分离、脱水和酒糟蒸发装置。本研究试图通过工业上可行的方法降低能源消耗，并最终降低乙醇价格。这些方法包括采用热耦合塔、分隔壁塔、单级/多级渗透蒸发工艺和蒸发器。研究了 9 种情景，并与使用热集成和热蒸汽再压缩系统的工业过程案例进行了比较。每个场景都使用 Aspen Plus® 进行模拟，并使用 Aspen 过程经济分析仪进行分析。使用 MATLAB 使用吸附-扩散理论和三守恒定律对亲水性聚合物膜的渗透蒸发过程进行建模。然后，估计渗透蒸发过程中所需的膜面积和温度下降。分隔墙塔将分离装置的能耗降低了 67%，资本成本降低了 19%。通过采用热耦合和热集成塔，能耗降低了 49%，资本成本降低了 17%。此外，乙醇脱水的四阶段渗透蒸发工艺被证明比变压吸附更有利可图。所提出和研究的方法降低了与工艺能耗相关的成本，并降低了生物乙醇的总生产成本。

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Energy saving alternatives for renewable ethanol production with the focus on separation/purification units: A techno-economic analysis

The bioethanol production process includes energy-demanding units with high operating costs, i.e., separation, dehydration, and stillage evaporation units. The present study attempts to reduce energy consumption and, ultimately, ethanol price through industrially feasible methods. These methods include adopting thermally-coupled columns, dividing-wall columns, single/multi-stage pervaporation process, and evaporators. Nine scenarios were studied and compared with an industrial process case using heat-integration and thermal vapor recompression system. Each scenario was simulated with Aspen Plus® and analyzed with Aspen Process Economic Analyzer. The pervaporation process with a hydrophilic polymer membrane was modeled with MATLAB using sorption-diffusion theory and three-conservation law. Then, the required membrane area and the temperature drop during the pervaporation process were estimated. The dividing-wall column reduced the separation unit's energy consumption by 67% and the capital costs by 19%. The energy consumption decreased by 49% by adopting thermally-coupled and heat-integrated columns, and capital costs were reduced by 17%. Moreover, the four-stage pervaporation process for ethanol dehydration proved to be more profitable than the pressure swing adsorption. The proposed and investigated methods reduce the cost associated with the processes' energy consumption and decrease bioethanol's overall production cost.

更新日期：2021-10-20

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