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中国石化(SINOPEC)某乙烯装置处理量为640kt/a,主流程为前脱丙烷前加氢、双脱丙烷流程,制冷系统为三元混合制冷系统。该制冷系统在为分离系统提供冷量,满足一些低温精馏塔再沸器加热需求的同时,还通过冷剂的预冷及过冷,有效回收工艺物流的冷量。利用流程模拟软件及其他相关优化软件,建立该乙烯装置分离系统和制冷系统的工艺模型,并利用模型分析在当前工况下,脱乙烷塔进料分配量发生变化时,对该塔、冷箱及制冷系统的影响,根据本装置特点,进行脱乙烷塔和三元制冷系统的联合操作优化。将脱乙烷塔的三股进料量分别由45t/h、35t/h及70t/h调整为45t/h、45t/h及60t/h,同时适当降低三元冷剂缓冲罐VB-465的压力,以带走从脱乙烷塔进料物流侧额外回收的冷量,并将这部分冷量用于脱甲烷塔及乙烯精馏塔的冷剂用户。优化调整后,最终减少三元制冷压缩机功率消耗约1117kW,每年节省操作成本505万元,优化效果明显。
Sinopec (SINOPEC) an ethylene plant capacity of 640kt / a, the main process before the former de-propane hydrogenation, double-de-propane flow, the refrigeration system for the ternary mixed refrigeration system. The refrigeration system provides cooling capacity for the separation system to meet the needs of some low-temperature distillation column reboiler heating, and also through the pre-cooling and sub-cooling of the refrigerant to effectively recover the cooling capacity of the process logistics. Process simulation software and other related optimization software were used to establish the process model of the ethylene plant separation system and refrigeration system. Using the model analysis, under the current operating conditions, when the deethanizer feed distribution changed, Boxes and refrigeration systems, according to the characteristics of the device, deethanizer and ternary refrigeration system to optimize the joint operation. The three feed amount of deethanizer was adjusted from 45t / h, 35t / h and 70t / h to 45t / h, 45t / h and 60t / h, respectively, while the amount of VB-465 Pressure to take over the additional recovered cold from the de-ethanizer feed stream side and use this portion of the cold for the demethanizer and ethylene rectification column users. After optimization and optimization, the power consumption of the ternary refrigeration compressor is reduced by about 1117kW, the annual operating cost is saved 5.05 million Yuan, and the optimization effect is obvious.