Analysis of the reasons for tube deformation in the radiation chamber of vertical cylindrical furnaces

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The atmospheric and vacuum distillation unit is equipped with one vertical cylindrical furnace, fitted with three oil-gas combined burners arranged at 120-degree intervals around the circumference. The furnace feed uses a dual-inlet, dual-outlet system; during normal operation, the balance of pressure between the two feed streams is controlled to ensure even feeding. After recently replacing the furnace tubes, the following issue was observed during operation: when natural gas was used as fuel, there were no problems when all three burners operated simultaneously. However, when fuel oil was used as fuel, 6 to 7 furnace tubes became severely deformed when all three burners were in use, with the deformation mainly occurring in the DN100 low-temperature furnace tubes at the entrance of the heating furnace. The deformation stopped after turning off the burner near the deformed area. When the three burners operate simultaneously, the flames do not touch the furnace tubes, and their heights are roughly equal. Dear sea friends, please help analyze the reason. Thank you!