Abstract In this research an process flowsheet is introduced for carbon dioxide conversion to methanol and a mathematical framework is prepared to analyze the operability of proposed plant. The main steps in the designed process are syngas production through methane tri-reframing, syngas purification, methanol synthesis in the isothermal reactor and syngas recycling. To develop a detail framework, the methane and syngas conversion sections are heterogeneously simulated based on the energy and mass conservation laws, and integrated with the considered equilibrium-based model for separation sections. To prove the correctness of developed model, the simulations results are compared with the experimental data at the same condition. Then, an optimization problem is formulated to determine the optimal operating condition of designed process considering methanol production capacity as objective. Since feeding policy is a key strategy to shift tri-reforming reactions toward the desired condition, the applied single-bed tri-reformer in the designed process is substituted by a multi-bed reactor and methanol production capacity is calculated. It concludes that applying the multi-bed reformer changes the tri-reforming reactions toward the hydrogen synthesis side and increases the methanol production rate from 200 to 265 ton day−1.

中文翻译：

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基于甲烷三重重整制甲醇的工艺建模与优化

摘要 在这项研究中，介绍了二氧化碳转化为甲醇的工艺流程，并准备了一个数学框架来分析拟建工厂的可操作性。设计工艺的主要步骤是通过甲烷三重重组生产合成气、合成气净化、等温反应器中的甲醇合成和合成气回收。为了开发一个详细的框架，甲烷和合成气转化段基于能量和质量守恒定律进行了非均相模拟，并与所考虑的基于平衡的分离段模型相结合。为了证明所建立模型的正确性，将仿真结果与相同条件下的实验数据进行了比较。然后，提出优化问题，确定以甲醇产能为目标的设计工艺的最佳运行条件。由于进料策略是将三重重整反应转变为所需条件的关键策略，因此设计工艺中应用的单床三重重整器被多床反应器取代，并计算甲醇生产能力。得出的结论是，应用多床重整器将三重重整反应向氢气合成侧转变，将甲醇产率从 200 吨天-1 提高到 265 吨天-1。将设计工艺中应用的单床三重转化器改为多床反应器，计算甲醇生产能力。得出的结论是，应用多床重整器将三重重整反应向氢气合成侧转变，将甲醇产率从 200 吨天-1 提高到 265 吨天-1。将设计工艺中应用的单床三重转化器改为多床反应器，计算甲醇生产能力。结果表明，应用多床重整器将三重重整反应向氢气合成侧转变，甲醇生产速率从 200 吨天-1 提高到 265 吨天-1。