摘要
管板环焊缝局部热处理是影响高压液氨预热器服役安全的关键制造技术,传统局部热处理时温度分布不均匀、管板约束大,导致残余应力难以消除。对此,采用主副加热局部热处理方法,并验证该方法在高压液氨预热器局部热处理时的有效性。计算与测试结果表明,传统局部热处理仅可降低外表面的轴向和环向残余应力,而内表面轴向应力会略微增大,环向应力降幅较小;主副加热局部热处理使内表面轴向应力由283 MPa降低至100 MPa以下,降幅约64%,环向应力由324 MPa降低至206 MPa,降幅约37%,显著降低了设备内表面应力腐蚀开裂的敏感性。
The local heat treatment of tubesheet’s girth weld means great to the service safety of high-pressure liquid ammonia preheaters.Both uneven temperature distribution and large tubesheet constraint in traditional local heat treatment make it difficult to eliminate residual stress.Therefore,the local heat treatment method for main and auxiliary heating was adopted,and the effectiveness of this method in the high-pressure liquid ammonia preheater was verified.Both calculation and test results show that,the traditional local heat treatment only reduces the axial and circumferential residual stress of the outer surface,while the axial stress of the inner surface increases slightly and the circumferential stress decreases slightly.The local heat treatment for the main and auxiliary heating can reduce the axial stress of the inner surface from 283 MPa to less than 100 MPa,a decrease of about 64%,and the circumferential stress from 324 MPa to 206 MPa,a decrease of about 37%,which can significantly reduce the sensitivity to stress corrosion cracking on the equipment’s inner surface.
作者
陈晶
徐成
张峥
苏厚德
张玉福
CHEN Jing;XU Cheng;ZHANG Zheng;SU Hou-de;ZHANG Yu-fu(Lanpec Technologies Limited(Shanghai);Lanpec Technologies Limited)
出处
《化工机械》
CAS
2024年第3期340-347,共8页
Chemical Engineering & Machinery
关键词
高压液氨预热器
局部热处理
管板环缝
残余应力
high-pressure liquid ammonia preheater
local heat treatment
tubesheet grith weld
residual stress
