结合化学链燃烧和 CO2 加氢的新型丙烷脱氢工艺的概念设计和技术经济分析,Energy Conversion and Management

丙烷脱氢是一种很有前途的丙烯生产技术，因为它可以减轻对石油资源的依赖。但丙烷制丙烯过程会产生大量的氢气和碳氢化合物，不仅浪费能源，直接燃烧取暖还会导致CO 2排放。为了解决这些问题，本研究提出了丙烷生产丙烯和甲醇的新工艺，首先通过变压吸附提取产品气中的氢气，然后将剩余的碳氢化合物进行化学循环燃烧以提供热量和高纯CO 2，​​以及氢气和CO 2最后反应生成甲醇。新工艺的火用效率从基本工艺的 77.61% 提高到 80.18%，其中约 98% 的直接 CO 2捕获和约 40% 的 CO 2利用率。新工艺的固定资本投资和产品总成本及总收益成本分别为42亿元和38.93亿元/年，比基础工艺分别增加8.11%和5.27%，主要是新增装置成本和电耗。而由于额外的甲醇收入，其年利润比基地工艺高出1400万元/年。研究得出结论，该新工艺在火用效率和CO 2捕获和利用方面具有优势，但在高资本投资方面处于劣势。

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Propane dehydrogenation is a promising propylene production technology since it can alleviate its dependence on oil resources. However, the propane-to-propylene process will produce a large amount of hydrogen and hydrocarbons, which will not only waste energy, but also lead to CO2 emissions if they are directly burned for heating. In order to address these problems, this study proposes a novel propylene and methanol production process from propane, in which the hydrogen in the product gas is firstly extracted by pressure swing adsorption, then the remaining hydrocarbons are subjected to chemical looping combustion to provide heat and high purity CO2, and the hydrogen and CO2 are finally reacted into methanol. The exergy efficiency of the novel process is increased from 77.61% of the base process to 80.18% with about 98% of direct CO2 capture and about 40% of CO2 utilization. The fixed capital investment and total product cost & gross earnings cost of the novel process are 4200 million RMB and 3893 million RMB/y, 8.11% and 5.27% higher than those of the base process caused by additional costs of new units and power consumption, while its annual profit is 14 million RMB/y higher than the base process due to the extra methanol income. The study concludes that the novel process is superior in exergy efficiency and CO2 capture & utilization, but inferior in high capital investment.