Abstract: This paper introduces the test run process of ethylene pyrolysis furnace, compares the three test runs of SL-Ⅱ ethylene pyrolysis furnace in different periods, and studies the effect of cracking condition changes on the pyrolysis product yields and product benefit. The results show that the test run data can reflect the actual operation of the pyrolysis furnace and provide references for the operation optimization and efficiency improvement of the ethylene plant.

Key words: SL-Ⅱ ethylene pyrolysis furnace, test run；yields of ethylene, propylene and butadiene, high value-added product yield, propylene to ethylene ratio；benefit per ton of material