林曉華 蘇成利 李平 等



摘 要: 利用PROII化工流程模擬軟件,對乙烯裝置急冷系統進行了流程模擬,將模擬結果與實際數據進行對比。在對模擬數據進行提取后,找到影響急冷油熱量回收關鍵操作參數。分析得出裂解氣進塔溫度、粗汽油回流量、裂解柴油采出量等操作參數與急冷油熱量回收值的關系曲線,結合裝置的實際生產提出了優化急冷油熱量回收的操作條件,為乙烯裝置急冷系統的優化生產和操作提供了理論依據和數據支持。
關 鍵 詞:急冷系統;流程模擬;PROII;熱量回收;操作優化
中圖分類號:TQ 221.21 文獻標識碼: A 文章編號: 1671-0460(2015)10-2328-04
Process Simulation of Quench System in Ethylene plant
and Optimization Analysis of Heat Recovery
LIN Xiao-hua1, SU Cheng-li1, LI Ping1,WANG Xiao-tao2
(1. School of Information and Control Engineering ,Liaoning Shihua University, Liaoning Fushun 113001, China;
2. School of Petrochemical Engineering, Lanzhou University of Technology, Gansu Lanzhou 73000, China)
Abstract: A simulator PRO-II was used to simulate the process of quench system in ethylene plant, and the simulated result and the practical data were compared. The simulated data were extracted to find out the important operating parameters affecting the heat recovery of the quench oil and conclude some relation curve graphs of heat recovery quantity of quench oil and operating parameters, such as tower inlet temperature of cracking gas, the reflux ratio of crude gasoline and the output quantity of pyrolysis gas oil, etc. Based on the practical production of plant, the optimized operation condition of the heat recovery of the quench oil was proposed. It provided theoretical basis and data support for optimizing production and operation of quench system in ethylene plant.
Key words: Quench systems; Process simulation; PROII; Heat recovery; Operation optimization
乙烯裂解裝置中的急冷系統是乙烯生產原料裂解后經過的第一道工序,具有流程復雜、處理量大、溫度高等特點。急冷系統的作用就是使210 ℃以上的高溫裂解氣經此系統處理后,分餾出裂解氣中的輕、重組分,使其溫度降低到40 ℃左右,并把裂解氣帶來的熱量逐級進行回收,以降低整個裝置的能耗[1]。
急冷油系統的熱量回收是乙烯裝置低端熱量回收的主要途徑,其熱量回收的多少對裝置能耗有很大的影響。目前針對國內乙烯裝置急冷系統熱量回收效率不理想這一現狀的研究,主要集中在對急冷系統內設備的工藝改造或結構改造[2-5]。雖然上述改造方法達到了提高熱量回收的效率,降低裝置能耗的效果,但難以提供出可靠理論依據和數據支持,更無法確定回收高品位熱量的最佳操作條件。
化工流程模擬技術[6,7]就是借助計算機來“再現”化工生產過程,并得到有關生產過程信息的數據。……