优化从陆上管道到近海船舶运输的二氧化碳的液化周期

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引用次数: 0

摘要

在碳捕集、利用和封存(CCUS)工艺链的二氧化碳运输领域,多项分析表明,对于大规模二氧化碳运输而言,陆上管道运输因其成本较低而成为首选方法。如果捕集地点靠近水道,驳船也是一种可行的替代方法。海运比管道运输更有优势,尤其是长距离和跨洋运输。尽管需要将二氧化碳液化并增加临时储存设施以便装卸到船上,但在固定的二氧化碳运输距离和工厂寿命范围内,船舶运输的最佳压力为 7 或 15 巴,具体取决于船舶类型。二氧化碳中的杂质来自各种工业流程和不同性能的捕获技术,会增加压缩过程中的能耗,并可能造成腐蚀风险。二氧化碳船舶运输规范对某些杂质的浓度有严格的限制。为了满足这些要求,人们提出了净化二氧化碳的方法,如双闪系统和汽提塔。所研究的二氧化碳液化方法表明,与开式或闭式循环相比,将开式循环与焦耳-汤普森膨胀相结合以及将闭式循环与冷却机相结合的混合循环可降低能耗,提高二氧化碳回收率。在管道中的杂质达到最大阈值的情况下,能耗几乎翻了一番,从 21.8 kWh/tCO2 增加到 40.9 kWh/tCO2,最高回收率上升了 98.1%。这项研究强调了优化二氧化碳运输战略以促进 CCUS 技术应用的重要性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Optimization of liquefaction cycles applied to CO2 coming from onshore pipeline to offshore ship transportation

In the field of the CO2 transportation for the Carbon Capture, Utilization and Storage (CCUS) process chain, several analyses show that, for a large-scale CO2 transportation, pipeline transportation is the preferred method on land due to its lower cost. Barges also present a feasible alternative if the capture site is near a waterway. Maritime transport becomes more advantageous than pipelines, particularly over long distances and across ocean. Despite the need to liquefy CO2 and to add temporary storage facilities for loading and unloading onto ships, beyond a certain distance at fixed CO2 transported and plant life, ship transport optimal at pressures of 7 or 15 bar depending on the type of vessel. Impurities in CO2, arising from various industrial processes and variable performances of capture technologies, increase energy consumption during compression and could cause corrosion risks. Specifications for CO2 ship transport limit the concentration of certain impurities with strict thresholds. Methods for purifying CO2, such as the two-flash system and stripping column, have been proposed to meet these specifications. The studied CO2 liquefaction methods show that hybrid cycles, combining open cycle with Joule-Thompson expansion and closed cycle with cooling machine offer reduced energy consumption and improved CO2 recovery compared to open or closed cycles. In the presence of the maximum threshold of impurities in the pipeline, energy consumption can nearly double from 21.8 kWh/tCO2 to 40.9 kWh/tCO2, with the highest recovery rising 98.1 %. This research underscores the importance of optimizing CO2 transport strategies to facilitate the deployment of CCUS technologies.

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