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首页> 外文期刊>Chemical Engineering Research & Design: Transactions of the Institution of Chemical Engineers >Absorption-hydration hybrid method for ethylene recovery from refinery dry gas: Simulation and evaluation
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Absorption-hydration hybrid method for ethylene recovery from refinery dry gas: Simulation and evaluation

机译：吸收-水化混合法从炼油厂干气中回收乙烯的模拟和评估

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摘要

Ethylene plays an essential role in petrochemical industry. Recovering ethylene from refinery dry gas is becoming increasingly important. Recently, hydration is proposed as a new method of separating ethylene from dry gas. This work builds the hydrate formation reactor model and simulates a process scale flow chart, which includes hydrate formation, absorption and cryogenic distillation. Economic evaluations are also performed. The optimal operating conditions and minimum total annual cost are found via optimization. Based on an industrial example, a butane absorption system is also simulated and evaluated. The total annual cost of the two process are compared and the cost distribution profiles are analyzed. Results show that the proposed absorption-hydration hybrid process (AHHP) is economically advantageous over the current butane absorption process. Major cost of butane absorption origins from column reboiler duty, whereas cost of the proposed AHHP mainly comes from compressor and hydrate formation refrigeration. Hence, if refrigeration from hydrate dissociation is reused, a significant portion of utility could be saved. In future work, refrigeration recovery techniques would become another meaningful topic for hydrate based gas separation. (c) 2016 The Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
机译：乙烯在石化工业中起着至关重要的作用。从炼厂干气中回收乙烯变得越来越重要。最近，提出了水合作为从干燥气体中分离乙烯的新方法。这项工作建立了水合物形成反应器模型，并模拟了工艺规模流程图，其中包括水合物形成，吸收和低温蒸馏。还进行经济评估。通过优化可以找到最佳的运行条件和最低的年度总成本。根据工业实例，还对丁烷吸收系统进行了仿真和评估。比较这两个过程的年度总成本，并分析成本分布图。结果表明，所提出的吸收-水合混合工艺（AHHP）在经济上比当前的丁烷吸收工艺更具优势。吸收丁烷的主要成本来自塔的再沸器负荷，而拟议的AHHP的成本主要来自压缩机和水合物形成制冷。因此，如果水合物分解产生的制冷被重新使用，则可以节省大量的效用。在将来的工作中，制冷回收技术将成为基于水合物的气体分离的另一个有意义的主题。 （c）2016年化学工程师学会。由Elsevier B.V.发布。保留所有权利。

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