Abstract: Under the background of "double carbon" target, petrochemical enterprises need to continuously improve the efficiency of energy utilization in the production process, especially the reasonable recovery and utilization of low-grade waste heat. Based on analysis of the heat recovery of the main hot materials of an oil and natural gas processing workstation of SINOPEC Corporation, the optimal pinch point temperature was found to be about 7 ℃, and the reasonable pinch point temperature ranged from 5℃ to 32 ℃ by the matching analysis of cold and hot logistics. While the pinch point temperature difference of the logistics above 20 ℃ in the workstation was 44.1 ℃, the overall heat transfer temperature difference was on the high side, and the waste heat had a great recovery potential. The results of the recovery and utilization of available waste heat by using compression heat pump technology showed that the total station could reduce energy consumption by about 10.62 × 10⁶ kgce/a (1 kgce = 29.3 MJ) and reduce CO₂ emissions by about 13 525 t/a. It was estimated to generate 6.85 million Yuan/a by saving natural gas consumption and 676 000 Yuan/a by reducing CO₂ emissions.

Key words: waste heat recovery, compression heat pump technology, energy optimization