Core Viewpoint - Yan'an Petrochemical Plant has successfully overcome technical bottlenecks in the drying system of the mixed dehydrogenation unit, enhancing the performance of the reaction product drying agent through multidimensional optimization, ensuring long-term stable operation of the unit [1] Group 1: Technical Improvements - The reaction product dryer plays a crucial role in removing hydrogen sulfide, aromatic solvents, and water from the reaction products [1] - In 2024, the unit experienced multiple instances of decreased adsorption performance of the drying agent, leading to increased hydrogen sulfide content in the output, which affected subsequent system operations [1] - The technical team optimized various parameters, controlling the aromatic solvent distillation range between 220°C and 385°C [1] Group 2: Operational Enhancements - The team adjusted the regeneration timing, reducing the single regeneration time by 10 to 12 hours, which improved the adsorption effect of the drying agent [1] - Special attention was given to the impact of cooling temperature on drying agent performance, leading to modifications in air cooling technology and increased cooling spray water [1] - The team finely tuned the sulfur injection amount in the reaction feed to maintain stable hydrogen sulfide content in the reaction products, ensuring optimal operation of the drying unit [1] Group 3: Performance Outcomes - The series of improvements led to a significant enhancement in the operation of the reaction product dryer, with the output hydrogen sulfide content decreasing from 50 ppm to 3 ppm [1] - The operational cycle of the dryer has been extended by more than six months compared to previous performance [1]