Abstract: As the key enterprises of carbon emission, the “Double carbon” target puts forward higher requirements for the high-quality development of refining enterprises. Through the calculation of the carbon emission of the whole plant and the carbon emission of each device in a 10Mt/a refinery, the carbon emission of the whole plant were 2885.247 kt/a, of which the combustion emission accounted for 31.32%, the coke burning of the catalytic cracking unit accounted for 32.55%, the hydrogen production process accounted for 18.05 %, and the purchased electricity accounted for 17.99%. According to the actual situation of the refinery, the emission could be reduced by 38.3 kt/a by improving the thermal efficiency of the heating furnace, by 95.4 kt/a by reducing the carbon content of fuel, and by 60-120 kt/a by digitizing and intelligentizing the construction. The emission of condensing steam turbine could be reduced by 188.7 kt/a when it was driven by electric motor, the emission of hydrogen production unit could be reduced by 197.6 kt/a and the emission of catalytic cracking unit could be reduced by 318.4 kt/a when the processing structure was optimized and the sulfur content of crude oil was reduced. In the long term, the full use of green electricity and green hydrogen, as well as the maturity of electric heating furnace and carbon capture, utilization and storage (CCUS) technologies, can reduce the carbon emission of 10-million-ton refineries to less than 500 kt/a.

Key words: oil refining enterprises, carbon emissions accounting, carbon emission reduction