关键词: 净化装置, 主吸收塔, 埋藏缺陷检测, 缺陷成因分析, 缺陷修复, 整体热处理, 安全评价

Abstract: The primary absorber of a gas field purification plant in China is a high-pressure and high-sulfur clad steel thick-wall tower. It is the key equipment. In recent years, it has been found that the buried defects of some tower shell welds exceeded the standard, and there was major risk of hydrogen sulfide leakage caused by crack growth and cracking. Through accurate detection, defect cause analysis, defect repair and research on the key technologies involving bulk heat treatment after repair and safety assessment of the high-pressure and high-sulfur clad steel thick-wall tower, this paper provides guarantee for the safe, stable and long-term operation of the purification plant.

Key words: purification plant, main absorption tower, buried defect detection, defect cause analysis, defect repair, bulk heat treatment, safety evaluation