双混合制冷剂天然气液化过程实验分析

摘要

浮式天然气液化装置(LNG-FPSO)具有便于迁移、设备可靠、安全性高等特点,适应于海上油气田的开发.而混合制冷剂流程效率高、处理量大,在海况较平稳、气田产量大的条件下具有明显优势.利用与中海石油气电集团技术研发中心合作研制的浮式双混合制冷剂液化实验装置来验证双混合制冷剂流程的准确性,并对目标气田的原料气产量、原料气入口温度及压缩机频率等进行敏感性分析,以及海上适应性进行研究评价.通过实验发现双混合冷剂液化工艺可满足平稳海况下大规模天然气液化处理,原料气温度、压力在一定范围内变化对流程影响较小,采用变频式压缩机可有效降低低负荷下系统能耗.%With the advantage of easy to migration, reliable of equipment and high security features, LNG-FPSO has great significance for the development of offshore gas field. The DMR liquefaction process has high efficiency and large capacity, which has obvious advantages under the conditions of stable sea and large amount of gas. The research verified the accuracy of the double mixed refrigerant flow, using the floating DMR experimental device which belongs to CNOOC Gas Electric R & D Center. The article analyzed the sensitivity of the NG's temperature, flow rate, and compressor frequency, and gave an assessment to the maritime adaptation. The experiment showed that the DMR process would be suitable in stable sea condition and mid to large-scale LNG production, and was not sensitive to the changes of gas temperature and pressure, it can effectively reduce the system energy consumption under low load by using inverter compress.