东方1-1气田CO_2长距离管道输送参数优化

Parameter optimization of long-distance CO_2 transmission pipeline of Dongfang 1-1 Gasfield

从相态控制角度,以东方1-1气田在海南岛陆上终端排放的CO2为例,开展了CO2长距离管输压力和管径的优化研究,并对管道入口压力、入口温度及环境温度等因素进行敏感性分析。结果表明:管输压力对CO2的输送相态具有重要影响,且很大程度上决定管径和壁厚,进而影响管道经济性;管输压力应保持在CO2临界压力之上,在无保温措施的情况下,CO2始终呈高压密相状态(超临界状态或液态),能保持管道的正常运行;对于东方1-1气田伴生CO2长距离输送方案,推荐管输压力为9MPa或16MPa,管材采用X65钢,不必采取保温措施。(图4,参14)

In the view of phase behavior control and taking the CO2 emissions of onshore terminal of Dongfang 1-1 Gasfield in Hainan Island as an example, an optimization research into transmission pressure and pipe diameter of long- distance CO2 transmission pipeline is carried out, and the sensitivity analysis for pipeline inlet pressure, inlet temperature and ambient temperature is performed. The results show that the transmission pressure has an important influence on CO2 transmission phase behavior, which will largely determine the diameter and wall thickness of pipeline to a great extent, and thus affect pipeline economics. The pipeline transmission pressure should be maintained above the CO2 critical pressure and CO2 should always be in high pressure dense phase state （supercritical or liquid state）. It is recommended that the pipeline transmission pressure should be 9 MPa or 16 MPa and X65 steel pipe material be used for long-distance transportation plan of associated COs of Dongfang Gasfield, and thermal insulation is not required. （4 Figures, 14 References）