焦炭塔顶挥发线应力和腐蚀问题探讨

STUDY ON STRESS AND CORROSION OF COKE DRUM OVERHEAD GAS LINE

分析了焦化装置焦炭塔顶挥发线运行时二次应力超标现象的产生原因,由于挥发线管道自重很大,易产生一次应力超标。另外,由于原料硫含量大幅度增加,碳钢材质的管道腐蚀严重。结合生产经验和分析计算,认为可以通过采用新的配管形式来降低挥发线的二次应力;合理设置支架防止一次应力超标;提高挥发线管道材质,以有效抵抗腐蚀。

The off-specification of secondary stress of coke drum overhead gas line in delayed coking unit is analyzed. It is easy for primary stress to exceed allowed specifications due to large pipe weight, and carbon steel pipelines suffer from severe corrosion resulted from increased amount of sulfur in feedstock. It is conclu- ded from operation experience and analysis that the secondary stress of gas line can be reduced by application of new pipeline design and off-specification of secondary stress can be prevented by installation of supports. In addition, the corrosion can be effectively controlled by upgrading the gas line material.