Two desorption towers of the CO₂ capture unit at the Dushanzi Petrochemical Power Station have been accurately installed

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On November 3, the Xinjiang Lifting and Transportation Project Department of CPECC First Construction Company set a record for efficiently lifting two large-scale towers in a single day at the construction site of the 2×400,000-ton/year CO₂ capture units for the power station of Dushanzi Petrochemical’s Tarim 1.2 million tons/year Phase II ethylene project. The core unit, the desorption tower (121—C—3101/3201), was successfully lifted using two cranes within a single day, laying a solid foundation for the subsequent operation of the CO₂ capture system. It is reported that as the \"core separation units\" of the CO₂ capture system, these two desorption towers play a key role in the purification and separation of CO₂; their successful installation is directly related to the efficiency of the capture process and the timeline for bringing the system into operation. The parameters of the two towers are exactly the same; each tower has a diameter of 4000 mm and a height of 33,799 mm. The wall thickness of the tower body is 33 mm/19 mm, and the lifting load for each tower is 111.4 tons. They need to be lifted to a height of 48,299 mm (over 48 meters) in order to be placed in position accurately. This constitutes a typical case of lifting large-diameter, ultra-long-span, heavy-load towers, which imposes extremely high demands on equipment coordination, process precision, and safety control. To achieve the efficient goal of lifting the structure twice in a day, the team took into account the characteristics of heavy-load and high-lift operations involving such towers, carefully calculated the lifting parameters, and innovatively adopted the \"single-main-crane lifting method\" – using an SCC5500A 550-ton crawler crane as the main lifting device, along with a 160-ton truck crane to assist in lifting the rear part of the tower. This combined approach, in which the main crane bears the primary load while the auxiliary crane adjusts the tower’s orientation, helps to prevent collisions with ground-based equipment during the lifting process. Furthermore, BIM technology is used to simulate the lifting trajectory, optimizing the crane’s positioning and lifting angle; the operating radius of the main crane is kept at 28 meters, while the delivery angle of the auxiliary crane is precisely set at 30°. This ensures that the tower can be erected smoothly before the auxiliary crane can be disengaged, providing technical support for using two cranes in a single day. It is reported that when lifting the first tower unit, the main crane operator precisely controlled the lifting speed, raising it steadily at a rate of 0.3 m/min; with the assistance of the auxiliary crane, the orientation of the tower unit was adjusted, and it took only 1 hour and 40 minutes to get the first tower unit in place accurately ； Furthermore, the project team quickly reviewed the experience gained from lifting the first tower, optimizing the distribution of forces at the lifting points of the second tower. At 3 p.m., the second tower was successfully lifted, and it was placed in position accurately at 5:30 p.m., thus achieving the goal of carrying out two lifts in one day.