炼油厂气体分馏装置用能的集成和优化

文摘: 气体分馏装置分布广,能量流密集, 对该装置进行节能研究, 具有重要意义. 近年来, 辆外许多炼油厂采用催化裂化装置与气分装置热联合技术, 使气体分馏装置能耗大幅度下降, 但盱热媒水温位和流量的限制, 使其能耗仍有较大下降空间通过对多套气体分馏装置的研究, 利用过程能量集成技术, 综合了某气体分馏装置的流程结构,工艺限制,用能优化目标及设备投资等多种因素, 对系统进行了用能调优分析. 在此基础上, 采用通用流程模拟软件对气体分馏装置进行了全流程模拟, 提出了节能技术方案(1). 对脱轻C4塔进行工艺参数调整后, 提高塔顶操作温度, 使脱轻C4塔塔顶蒸汽作为丙烯塔再沸器热源, 实现多效蒸馏; (2). 脱丙烷塔由单塔流程改为高低压双塔, 高压塔为非清晰分割, 低压塔采用清晰分割; (3). 对热媒水换热网络进行调优,品种以保证新工况下热媒水的输入热量不变, 从而减少系统1.0MPa蒸汽的乃是. 通过该方案使装置能耗下降了669MJ/t, 单耗下降了19%, 1年收回投资. 脱轻C4塔与脱丙烯塔间进行多效蒸馏, 脱丙烷塔双塔流和的新工艺可靠,节能效果显著, 具有普遍推广价值.

ENERGY INTEGRATION AND OPTIMIZATION OF GAS FRACTIONATION UNIT IN REFINERY

The gas fractionation units are widespread in petrochemical companies. The study on energy saving for these devices is of important significance. In recent years, many factories have adopted the heat-united technology, which combines the heat from catalytic cracking unit and the gas fractionation unit. This heat-united technology greatly decreases the energy consumption of gas fractionation unit. There is still a large space for the decrease of energy consumption due to the limitation of the temperature-level and flux of hot media water in gas fractionation unit. Based on the study of many gas fractionation units, an optimization analysis on the energy consumption of the gas fractionation unit was presented by utilizing process energy integration technology and synthesizing various factors, such as process structure, technique limit, optimization objective of energy consumption and equipment investment of one gas fractionation unit. Based on the analysis of optimization on the energy consumption of the system, a total process simulation was practised by adopting the current process simulation software and some energy saving plans were put forward, including: (1) raising the temperature at the top of deisobutenizing tower by using the top vapor of deisobutenizing tower as a heat source of the propene tower to achieve multi-effect distillation; (2) changing the depropanizing tower from single tower into high-low-pressure double tower, in which the high-pressure tower adopts non-sharp splits and the low-pressure tower adopts sharp splits; (3) optimizing the heat exchanger network of hot media water to ensure its stable heat load under the new condition, resulting in consumption reduce of 1.0 MPa steam. The energy consumption of the unit will drop by 669 MJ/t and the energy consumption of per ton product will drop by 19% and the payback time will be less than one year. The new technique that the multi-effect distillation of deisobutenizing tower and propene tower and the double depropanizing tower is put forward by process energy integration technology to achieve optimization of energy saving based on the study on gas fractionation units, which is reliable and the effect of energy saving is significant.