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On June 18th, it was learned that Daqing Petrochemical has shipped over 1,500 tons of cross-linked polyethylene resin produced using an online switching mode to downstream customers. This marks the first time Daqing Petrochemical's Polyolefins Department has achieved continuous online switching of product grades without shutdown on its low-pressure unit's C line. This is another technological breakthrough following the implementation of dual-reactor production for cross-linked polyethylene resin.
The low-pressure unit's C line is responsible for developing and producing high-value-added new products, producing 5 to 6 grades per month. Stable online continuous switching between conventional grades has been achieved. However, for new products like cross-linked polyethylene resin, which have high market acceptance and a full order book, it's crucial to eliminate interference factors as much as possible during the initial production phase, quickly identify patterns, accumulate operational experience, and solidify key process parameters. Therefore, initial grade switching employed a clean production mode involving shutdown and material return, with each shutdown and restart averaging approximately 39 hours, limiting the overall capacity of the unit.
To overcome this production bottleneck, the Polyolefins Department established a special task force to systematically review the entire process, focusing on comparing key parameters such as C/H ratio, temperature, and pressure. Parameter adjustments and process simulations were conducted, and detailed quality and safety control rules were formulated. During the switchover, team members remained on-site in both the control room and the production site, ensuring close cooperation between internal and external operators to guarantee stable production operations and product quality. Calculations showed that the single switchover time was reduced to 15 hours compared to before. Based on a feed load of 8.5 tons/hour, this increased ethylene processing capacity by 204 tons and reduced economic losses from downtime by 136,000 yuan.
This successful continuous switchover between grades has made the unit's operation more seamless and consistent, providing strong support for subsequent production scheduling of cross-linked polyethylene resin. Moving forward, Daqing Petrochemical will continue to focus on improving quality, reducing costs, and increasing efficiency, continuously strengthening its efforts in refined management and technological innovation to promote the safe, stable, and efficient operation of the unit.
