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炼厂延迟焦化加热炉的炉管,材质为Cr5Mo,规格φ102×10mm,启用日期69年10月,至今已运行十二万小时。管内介质为减压渣油,渣油进口温度约400℃,出口温度为510℃,最高炉管外壁温度在操作中接近650℃,在烧焦过程中短期内可达到700℃以上,管内压力为35kg/cm~2。在1983年底检修试压中,发现炉内第21号炉管外表面有局部断裂,出现渗漏。为此我们取样作了失效分析。一、宏观检查将炉管断裂处解剖后,发现内外壁均有较厚的氧化皮,内壁氧化皮厚约2.0～3.5
Refinery delayed coking furnace tube, made of Cr5Mo, size φ102 × 10mm, the opening date of October 69, has been running 120,000 hours. The medium in the pipe is vacuum residue. The inlet temperature of residual oil is about 400 ℃ and the outlet temperature is 510 ℃. The temperature of the outermost wall of the highest furnace tube is close to 650 ℃ during the operation and can reach over 700 ℃ in the short term in the scorching process. 35kg / cm ~ 2. At the end of 1983 overhaul pressure test found that furnace No. 21 furnace tube surface partial rupture, leakage occurred. For this we sampled the failure analysis. First, the macro inspection The anatomy of the furnace tube rupture and found that the outer wall have a thick oxide scale, the inner wall thickness of about 2.0 to 3.5