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对于大型浮式液化石油气(FLNG)装置,液化工艺是整套装置非常关键的技术之一。混合制冷剂液化工艺具有流程简单、设备少、效率高、功耗小等优点,已广泛应用于陆上液化工厂,且将用于海上FLNG装置。混合制冷剂可细分成不同的工艺,不同的液化工艺具有不同的特点和适用范围。利用HYSYS软件对不同进料流量、甲烷组分比例和重组分比例下的三种混合制冷剂工艺进行了模拟,对比了三种流程的能耗与设备特征,分析了适用于不同液化能力浮式装置的工艺流程。结果表明:在天然气进气流量为65 000m3/d的条件下,丙烷预冷混合制冷剂循环(C3MR)压缩机比功耗为0.330 9,双混合制冷剂循环(DMR)比功耗为0.225 4,单混合制冷剂循环(SMR)比功耗为0.245 1;C3MR流程关键设备数量最多,DMR次之,SMR设备最少;C3MR所需的制冷剂量最大,SMR最小;随着原料气中甲烷含量的变化,C3MR比功耗的变化最大,DMR、SMR比功耗变化较小。
For large floating liquefied petroleum gas (FLNG) units, the liquefaction process is one of the key technologies for the complete unit. The mixed refrigerant liquefaction process has the advantages of simple process, less equipment, high efficiency and low power consumption, and has been widely used in onshore liquefaction plants and will be used in offshore FLNG plants. Mixed refrigerant can be subdivided into different processes, different liquefaction processes have different characteristics and scope of application. HYSYS software was used to simulate the three mixed refrigerant processes under different feed flow rates, methane fraction ratios and heavy fraction ratios. The energy consumption and equipment characteristics of the three processes were compared and analyzed. Device process. The results show that the specific power of propane pre-cooling C3MR compressor is 0.330 9 and the specific power of double mixed refrigerant cycle (DMR) is 0.225 4 at a natural gas inlet flow rate of 65 000m3 / d , And the specific power consumption of single mixed refrigerant cycle (SMR) was 0.245 1; the number of key equipment in C3MR process was the largest, followed by DMR and the SMR equipment was the least; the refrigerant required by C3MR was the largest and the SMR was the smallest; with the methane content in the feed gas Changes, C3MR than the largest change in power consumption, DMR, SMR smaller changes in power consumption.