Abstract

Power plant gases are a source of carbon dioxide emissions that can be converted by thermo-chemical as an opportunity to produce chemical products such as methanol. In this study, the thermodynamic improvement of the methanol production process through natural gas vapor reforming and utilization of recycled carbon dioxide as a secondary source of carbon has been done along with economic and environmental analyzes. Sensitivity analysis showed that the optimal flow rate of carbon dioxide for injection into the methanol synthesis reactor should be 580 kmol/h. So that the stoichiometric number of the synthesized gas is controlled in an appropriate amount of 2, and the carbon efficiency process reaches 85%. Energy analysis was performed for the process, and it was found that the overall energy efficiency is 77.26%, which has a significant advantage compared to previous works. The use of an integrated network of heat exchangers has led to the recovery of 440.89 gigajoules per hour of energy, which has a great impact on improving the thermodynamics and reducing the intensity of process pollution. Based on the environmental analysis, the use of flue gas flow as a heat source for heating in reboilers of methanol separation towers has caused the global heating potential parameter for the pro\({\text{k}}^{'}\)posed process is 0.265\(\frac{{{\text{k}}{{{\text{g}}}_{{{\text{C}}{{{\text{O}}}_{{2,{\text{eq}}}}}}}}}}{{{\text{k}}{{{\text{g}}}_{{{\text{MeOH}}}}}}}\). Also, the results of the exergy evaluation indicated that the presented process, with an overall exergy efficiency of 77.32%, has a good position among the other technologies. According to the study, the total degraded exergy is 238468.21 kW, which is the equipment and process parts, burner reformer and synthesis gas production sector with the share of 30 and 47%, respectively, have the highest exergy destruction. An economical estimate was made for the proposed project, and it was showed that the annual profit of the project is 4630926/033 $, the total investment cost is 96820215/07$, the annual revenue is 60673626/03$, and the minimum selling price of the product as a competitive parameter is 0/099\(\frac{{{\text{USD}}}}{{{\text{k}}{{{\text{g}}}_{{{\text{Methanol}}}}}}}\).

中文翻译：

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甲醇生产过程的模拟和热力学改进及经济分析：天然气蒸气重整和碳捕集利用

摘要

发电厂气体是二氧化碳排放的一个来源，可以通过热化学转化为生产甲醇等化学产品的机会。在这项研究中，通过天然气蒸气重整和利用回收二氧化碳作为二次碳源对甲醇生产工艺进行了热力学改进，并进行了经济和环境分析。敏感性分析表明，注入甲醇合成反应器的最佳二氧化碳流量应为580 kmol/h。使得合成气的化学计量数控制在2合适，碳效率过程达到85%。对流程进行能量分析，发现整体能量效率为77.26%，与之前的作品相比，具有显着的优势。使用集成换热器网络每小时可回收440.89吉焦耳的能量，这对改善热力学和降低过程污染强度产生了巨大影响。根据环境分析，甲醇分离塔再沸器采用烟气流为热源加热，引起了该工艺的全局热势参数。\({\text{k}}^{'}\)所提出的过程是 0.265 \(\frac{{{\text{k}}{{{\text{g}}}_{{{\text{C }}{{{\text{O}}}_{{2,{\text{eq}}}}}}}}}{{{\text{k}}{{{\text{g}} }_{{{\text{甲醇}}}}}}}\)。此外，火用评价结果表明，该工艺的火用效率总体为77.32%，在其他技术中处于领先地位。研究表明，总降解火用为238468.21kW，其中所占比例分别为30%和47%的设备及工艺部件、燃烧器重整器和合成气生产部门，火用破坏程度最高。对拟建项目进行了经济估算，项目年利润为4630926/033 $，总投资成本为96820215/07$，年收入为60673626/03$，最低销售收入为作为竞争参数的产品价格为 0/099 \(\frac{{{\text{USD}}}}{{{\text{k}}{{{\text{g}}}_{{{ \text{甲醇}}}}}}}\)。