摘要
在实际的管输CO_(2)过程中,受温度、压力、流量变化的影响,不可避免地会生成水合物。为降低水合物造成的管道堵塞及腐蚀问题,以某管输流量30×10^(4) t/a的超临界CO_(2)管道为例,通过OLGA软件和CSMHyK动力学模型,考察了稳定工况、停输工况及再启动工况条件下的基础参数变化情况,并对水合物的生成条件、生成区域和生成量进行了定量描述,得出了水合物的生成特性。研究结果表明,杂质的加入使CO_(2)相平衡中形成了气液两相区,相平衡曲线向右移动,不利于管道的安全平稳运行;稳态运行工况下12 km以后的区域生成水合物,但生成量较小;停输工况下水合物生成区域向管段前方移动,从1 km处开始有水合物生成,最大水合物浓度为23.36 kg/m^(3);再启动初始阶段水合物生成区域和生成量有所增加,随后水合物生成区域后移至稳态时的12 km处。此项研究结果可为CCUS技术的推广和应用提供实际参考。
In the actual process of CO_(2) pipeline transportation,hydrates are inevitably generated due to the changes in temperature,pressure,and flow rate.In order to reduce the pipeline blockage and corrosion problems caused by hydrate formation,a supercritical CO_(2) pipeline of 30×10^(4) t/a is taken as an example.Based on OLGA software and CSMHyK dynamic model,the changes in basic parameters under stable conditions,shutdown conditions,and restart conditions are investigated.The formation condition,region and amount of hydrate are quantitatively described,and the formation characteristics of hydrate are studied.The results show that the addition of impurities causes the formation of a gas-liq-uid two-phase zone in the CO_(2) phase equilibrium,and the phase equilibrium curve moves to the right,which is not conducive to the safe and stable operation of the pipeline.Under steady operation conditions,hydrates are generated in the region after 12 km,but the amount is small.Under the shut-down condition,the hydrate formation area moves to the front of the pipeline section,and the hydrate generation starts from 1 km,with the maximum concentration of 23.36 kg/m^(3).In the initial stage of re-start,the hydrate formation area and the amount of production increase.Then the hydrate formation ar-ea moves back to the 12 km area under the steady operation condition.The results can provide a practi-cal reference for the popularization and application of CCUS technology.
作者
李红敏
LI Hongmin(Daqing Fangxing Oilfield Development Co.,Ltd.)
出处
《油气田地面工程》
2023年第8期1-5,共5页
Oil-Gas Field Surface Engineering
