Abstract: This paper provides an in-depth analysis of the challenges faced by China's petrochemical industry under the "Dual Carbon" goals, emphasizing that improving energy efficiency is an essential pathway to achieve these targets. Through a case study on the deep utilization of low-temperature waste heat in a petrochemical enterprise of China National Offshore Oil Corporation (CNOOC), the study systematically examines the technical principles, implementation methods, and economic benefits. The findings offer both theoretical foundations and practical references for the advanced utilization of waste heat in petrochemical plants.

Key words: low-temperature waste heat, heat pump distillation, condensate recovery, thermal coupling, energy saving and carbon reduction