超临界二氧化碳输送中的增压问题分析

Analysis on the Pressurization in Supercritical Carbon Dioxide Transport

CCS/CCUS技术是实现碳减排的重要手段,CO_(2)增压和超临界输送技术是其中关键技术之一。含杂质CO_(2)混合物相态变化和热物性的准确预测十分复杂,给增压系统方案确定和设备制造带来挑战。分析了CO_(2)主要热物性和杂质的影响,压缩机和泵应用于CO_(2)超临界输送中的典型增压方案,以及设备选型和国产化情况。在借鉴国外相关工程经验基础上,提出应根据现场环境条件、上下游需求进行技术经济比选确定具体增压方案,应重视增压热回收利用,充分利用水在CO_(2)中溶解度变化特性进行脱水,综合进行系统优化以降低排放并提高运营效率,进一步加大CO_(2)增压设备国产化力度等建议。

The technologies of CCS/CCUS serve as the major method of realizing the reduction of carbon emission.CO_(2)supercharging and supercritical transport technology are key technologies among them.The phase change of CO_(2)mixture containing impurities and the accurate prediction of thermophysical property are quite complex,bringing challenges to the determination of the pressurizing system plan and the equipment manufacturing.This paper has analyzed the impact of the major thermophysical property and impurities of CO_(2),the typical pressurizing plan of applying compressor and pump into CO_(2)supercritical transmission as well as the selection of equipment type and the situation of domestic manufacturing.Referring to the experience on related projects overseas,the paper has proposed to decide on the specific pressurization plan after technical and economic comparison based on the environmental conditions and the upstream and downstream demands.Moreover,herein this paper,the author stresses the pressurized heat recovery and utilization and the comprehensive usage of the solubility change feature of water in CO_(2)before dewatering.In addition,the author suggests that the systematic optimization should be carried out so as to lower carbon emission and increase the operation efficiency and the CO_(2)pressurization equipment should be manufactured by our own country with more efforts.