对石油工业用四合一加热炉火管裂纹进行分析后，认为燃油火嘴雾化不好，火管内耐火层短，火管被垫板所覆盖的管壁与垫板之间产生汽化膜，造成火管局部位置过热；又因火管母材存在硫化物夹杂，致使火管产生裂纹。为保证设备运行，采取了更换部分火管，提高燃油温度，加长耐火墙，去除垫板等措施。处理后的加热炉，经４个多月的使用未发现问题。 After analyzing the fire tube crack of the four-in-one heating furnace in the oil industry, it is considered that the fuel nozzle fogging is not good, the refractory layer in the fire tube is short, and the fire tube is vaporized between the wall and the backing plate covered by the backing plate, Resulting in local fire tube overheating; and because of sulfide tube parent material inclusions, resulting in fire tube cracks. In order to ensure the operation of the equipment, some measures such as replacing part of the fire tube, raising the temperature of the fuel oil, lengthening the fire-resistant wall and removing the pad are adopted. After treatment of the furnace, after more than four months of use found no problem.