Lanzhou Petrochemical Yulin: Successful Transition to High-Density Polyethylene (HDPE)!

This production transition involved complex adjustments of process parameters. Yulin Company formulated a detailed transition plan and operating instructions in advance, with a particular focus on the precise adjustment of key parameters such as catalyst dosage, hydrogen concentration, comonomer feed rate, as well as reaction temperature and pressure. Operators of the high-density polyethylene unit closely monitored parameter trends and operated with precision, ensuring that core product indicators such as melt index and density quickly and smoothly transitioned into the control range of the new grade. This minimized the generation of transition material to the greatest extent possible and achieved the goal of an efficient and high-quality production switch.

This production switch is not only a product changeover, but also a valuable opportunity for preventive maintenance of equipment. The High-Density Polyethylene Operation Department made full use of this opportunity to simultaneously carry out maintenance tasks such as replacing the bearing of Centrifuge B and cleaning key equipment in the fluidized bed during empty-bed purging. The equipment team responded swiftly and efficiently completed the planned bearing replacement task for Centrifuge B, effectively resolving potential equipment risks and restoring it to optimal operating condition. At the same time, by taking advantage of the reactor system’s low-load operation period, technicians thoroughly purged the fluidized bed, removing any residual materials and fine powders inside. This created the best possible reaction environment for the next stage of producing pipe-grade material 23050, achieving seamless integration between production and maintenance.

The meticulous arrangement of combining process transfer with equipment maintenance this time fully reflects Yulin Company's philosophy of refined management and deep potential exploration. Through the meticulous arrangement of "one transfer for multiple uses," not only was the production order for grade switching completed in one go, but the opportunity was also taken to significantly enhance the operational reliability of key equipment, effectively reducing the probability of unscheduled shutdowns. This provides a strong guarantee for the subsequent continuous high-load, long-cycle optimized operation of the plant.

At present, the high-density polyethylene (HDPE) unit has fully entered the stable production stage of injection molding material HS GC7260, with all product indicators performing excellently. The successful completion of this product transition and maintenance work has provided a solid equipment guarantee for the unit to win the final battle at the end of the year. All employees of the unit are maintaining high morale, focusing closely on the annual output and efficiency targets, meticulously organizing production, optimizing operations, and thoroughly tapping the potential of the unit. They are going all out to sprint towards the successful completion of the annual production and operation tasks.