Abstract: In response to the issue of low-temperature heat recovery and utilization of air coolers in some refinery units, the factors such as the grade of low-temperature heat source, load, process medium characteristics and operating conditions of the air coolers in each unit were analyzed comprehensively. According to seasonal variation, considering the periodicity fluctuation of the heat trap, the heat trap was set up to recover the heat step by step, and two sets of low-temperature heat recovery and utilization systems were set up to realize reasonable utilization of low-temperature heat in the air cooler. Two sets of low-temperature heat recovery and utilization systems can recover 299.3 MW heat, and the recovered low-temperature heat can be used for power generation, refrigeration, process unit heating, pipeline equipment tracing, building heating, and other aspects. All low-temperature heat can be fully utilized in winter, and surplus in summer.

Key words: air cooler, low-temperature heat, heat sink, recovery, utilization