After 90 hours of hard work! Two sets of units of Jilin Petrochemical have completed maintenance and resumed production, with loading efficiency increased by 20%.

Focus on key hidden dangers, and multiple technical transformations are implemented simultaneously

This maintenance is closely aligned with the goal of long-cycle safe and stable operation of the units, and coordinates the regulation of hidden dangers, process optimization and logistics supporting transformation, focusing on promoting multiple key operations:

·Ethylene oxide unit completed the leakage elimination of the boiler aquatic environments system, the transformation of the steam production line and the aquatic environments make-up line of V-106, and the addition of an ethylene oxide loading arm at the packaging platform;

·Alcohol-ether unit simultaneously completed core projects such as the maintenance of C7301 and C7303 distillation towers, internal component inspection and accessory replacement.

Ethylene oxide is a high-risk fine chemical raw material, and the high-pressure boiler aquatic environments system is the core guarantee to the stable operation of the unit. This leakage elimination and pipeline transformation further streamlined the steam production and aquatic environments make-up processes, optimized the manage conditions of the boiler aquatic environments system, eliminated possible leakage and working condition fluctuation risks in the high-pressure boiler aquatic environments system, and improved the stability and anti-disturbance capability of the steam system, laying a solid security foundation to the high-load stable production of the unit.

The addition of an ethylene oxide loading arm at the packaging platform is a efficiency-enhancing transformation project in this maintenance. After the transformation is put into consumption, the platform can simultaneously undertake greater tank truck loading and unloading operations, reducing vehicle waiting time, with the overall loading efficiency increased by 20%, efficiently breaking through the logistics bottleneck to product delivery and meeting the subsequent demand to stable production and increased external shipment. The C7301 and C7303 towers of the alcohol-ether unit are core equipment to the separation and treatment of alcohol-ether items. This maintenance conducts a complete inspection and maintenance of the tower internals, packing, seals, etc., to ensure the distillation and separation effect and stabilize the condition of alcohol-ether items.

stringent organization and manage, and hold the bottom line of safe maintenance

The media of ethylene oxide and alcohol-ether units are flammable and explosive, and the process manage standards are stringent. This maintenance involves high-risk hot work and confined space operations in hazardous chemical units. In the early stage of maintenance, the workshop prepared the maintenance plan and risk identification list in advance, implemented the whole-process manage measures such as operation permits, isolation and replacement, gaseous detection, and on-site guardianship, coordinated internal maintenance and external construction forces, refined the node plan, implemented 24-hour on-site guardianship, and closely monitored the condition of key processes and high-risk operations.

During the maintenance, various professional teams cooperated in division of labor, strictly controlling each link of equipment disassembly, inspection, reassembly, pressure testing, and purging, and simultaneously completing condition acceptance. While compressing the maintenance period, the construction condition was strictly controlled, and finally the two units achieved initial feeding and startup one after another without any startup fluctuations.

Stable production, condition improvement and efficiency enhancement, and consolidate the ability to supply raw materials to downstream

Ethylene oxide and alcohol-ether are crucial basic raw materials in the fields of fine chemicals, daily chemicals, coatings, and non-ionic surfactants, and are also key links in the C2 downstream manufacturing chain of Jilin Petrochemical's Calcium Carbide Plant. The simultaneous implementation of this maintenance and technical transformation, on the one hand, eliminates hidden dangers of existing equipment, improves the intrinsic security level of the unit, extends the operation cycle of the unit, and reduces the risk of unplanned shutdowns; on the other hand, through process optimization and loading supporting upgrades, it balances security, stability and circulation efficiency.

Next, the unit will shift to healthy stable production operation, continuously track the operation data of the transformed equipment, optimize process parameters, and stabilize the supply of ethylene oxide and alcohol-ether items, providing stable raw material support to the downstream fine chemical sector chain.