炼油厂避免硫化物腐蚀失效的指南

[中文适用范围]： 该推荐做法 (RP) 适用于含有含硫化合物@且不存在氢气 (H2)@的烃工艺流，其在高于约 500℃（260℃至约 1000℃（540℃）的温度下运行。 . 对于无氢硫化的正确阈值温度@，业界存在相当大的争论，本版中@ API 571 阈值温度为 500℃（本文采用 260℃）。经验表明，没有什么显着影响。腐蚀将在低于 500℃（无环烷酸腐蚀影响的无 H2 硫化工况下为 260℃）的工作温度下发生。硫醇腐蚀@特别是在凝结水工况中@已报告低于此温度，但在第二部分中并未明确涵盖API 939-C 版本。对于含 H2 服务@，阈值温度设置为 450℃（230℃）。未提供硫含量的下阈值限值，因为某些设备的再沸器/分馏器部分发生了严重腐蚀。加氢处理装置（不含 H2）的硫或硫化氢 (H2S) 测量浓度低至 1 ppm。镍 (Ni) 基合金在热 H2S 环境中的腐蚀不属于本文件的范围。此外，虽然硫化可能是一些硫回收装置中的一个问题，但硫工厂燃烧部分和由于在加热器中燃烧含硫燃料而导致的加热器管的外部腐蚀被明确排除在本文件的范围之外。 [外文原描述]： This recommended practice (RP) is applicable to hydrocarbon process streams with sulfur-containing compounds, without the presence of hydrogen, which operate at temperatures above approximately 500 °F (260 °C) up to about 1000 °F (540 °C). There is considerable debate in the industry as to the correct threshold temperature for hydrogen free sulfidation and in a change in this Edition, the API 571 threshold of 500 °F (260 °C) is adopted herein. Experience has shown that little significant corrosion will occur at operating temperatures below 500 °F (260 °C) for hydrogen free sulfidation services without the influence of naphthenic acid corrosion. Mercaptan corrosion, particularly in condensate service, has been reported below this temperature, but is not explicitly covered in the 2nd Edition of RP 939-C. For hydrogen containing services, the threshold temperature is set at 450 °F (230 °C). A lower threshold limit for sulfur content is not provided because significant corrosion has occu