In the cold winter months, the project construction in Dalian Changxing Island Hengli Polyester Technology Industrial Park with a total investment of 50 billion yuan is still fiery. Two sets of ethylene oxide refining towers, each with a length of 92.95 meters and a weight of 431 tons, are the core equipment of the ethylene oxide unit, and they are also the tower unit with the largest scale and capacity in its industry.