Based on the Analysis Report on Raw Materials to Cracking Furnace issued regularly by the Research Institute, the professional departments of PetroChina Dushanzi Petrochemical Company pay close attention to the changes in raw material quality and properties through the dynamic monitoring of cracking raw materials and focus on the advanced indicators in the industry to timely adjust the proportion of high-quality cracking raw materials entering the plant. The Research Institute and the production workshops jointly optimize the process operation of the ethylene plant, and carry out comprehensive quality monitoring of the incoming raw materials from the source workshop. Off-spec raw materials will not be unloaded in the railway and truck loading/unloading areas or delivered from the tank area of transportation and storage joint workshop. All the raw materials with out-of-tolerance indicators are to be reviewed to reduce the potential quality risk, so as to achieve the comprehensive quality control of plant-wide liquid and solid products and the goals of high product output and yield.

乙烯装置开停工过程中的火炬排放是制约其成本的关键。同时，火炬的排放会影响环境，随着环保要求的提高，如何降低开车成本和火炬排放量，成为企业关注的核心。着重介绍了中国石油独山子石化分公司乙烯装置氮气预冷开车的过程，在正式投料前通过裂解气压缩机进行氮气循环对冷箱系统进行预冷，将冷箱最低温度降低至-120 ℃。另外，针对具体流程进行了相应的技术改造，对预冷后的冷分离区域进行提前充压至进料压力，同时对热分离区进行提前充压充液全回流操作，一旦接料可直接产出合格的塔顶和塔釜产品，以此减少开停工过程中的火炬排放，实现了停工过程“气不上天、油不落地、声不扰民、尘不上天”的绿色环保停工目标。