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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)
From the perspective of phase control, taking the CO2 emitted from the land surface of Dongfang 1-1 gasfield in Hainan Island as an example, the optimization research on the pressure and pipe diameter of CO2 long-distance pipelines was carried out. The inlet pressure, inlet temperature and ambient temperature And other factors for sensitivity analysis. The results show that the pipe pressure has an important influence on the phase transport of CO2, and largely determines the pipe diameter and wall thickness, which will affect the pipeline economy. The pipe pressure should be kept above the critical pressure of CO2. CO2 is always in the state of high pressure and dense phase (supercritical state or liquid state), which can keep the normal operation of the pipeline. For the long-distance CO2 transmission scheme of the east 1-1 gas field, the pipe transfer pressure is recommended to be 9MPa or 16MPa. X65 steel, do not take thermal insulation measures. (Figure 4, reference 14)