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Impact of Wash Water Injection on Corrosion Control in a Gas Recovery Unit

机译：冲洗水注入对气体回收装置中腐蚀控制的影响

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Continuous wash water injection in gas recovery units (GRU) has always been recognized as a best practice method for corrosion control. Among other functions, wash water injection in these systems traps cyanides and carries them away with the stream, thereby efficiently reducing the negative impact of cyanides on the system. The main damage mechanisms likely to impact GRUs are sour water corrosion (SWC), hydrogen induced cracking (HIC), and stress oriented hydrogen induced cracking (SOHIC). All these damage mechanisms are closely related to the presence of H_2S in an aqueous environment. Presence of cyanides in the system exacerbates these corrosion and cracking tendencies, since cyanides are known to inhibit the combination of atomic hydrogen to form molecular hydrogen (H_2) gas. If this combination reaction does not take place, the steel wall becomes saturated with atomic hydrogen. The permeated atoms may eventually combine at microstructural defects and cause wet H_2S damage, which could lead to cracking and through-wall penetration. The case study described in this paper discusses failures that occurred in the wash water injection system. These failures caused the GRU to operate in the absence of wash water which meant that cyanides were not efficiently trapped or removed. The onset of hydrogen permeation was detected and measured using field inspections and hydrogen permeation probes. Condition monitoring was also performed downstream in the amine recovery unit (ARU) by tracking the level of heat stable salts. These measures helped reactivate the wash water injection program in a timely manner and avoid potential future failures downstream in the GRU compression systems.
机译：气体回收装置（GRU）中的连续冲洗水注水一直被认为是腐蚀控制的最佳实践方法。除其他功能外，在这些系统中注入冲洗水可以捕集氰化物，并将其随物流一起带走，从而有效地减少了氰化物对系统的负面影响。可能影响GRU的主要破坏机制是酸水腐蚀（SWC），氢致裂纹（HIC）和应力导向的氢致裂纹（SOHIC）。所有这些破坏机制都与水性环境中H_2S的存在密切相关。由于已知氰化物会抑制原子氢的结合以形成分子氢（H_2）气体，因此系统中氰化物的存在会加剧这些腐蚀和开裂的趋势。如果不发生这种结合反应，则钢壁会被原子氢饱和。渗透的原子最终可能会在微结构缺陷处结合并引起湿H_2S破坏，这可能导致开裂和穿墙穿透。本文描述的案例研究讨论了冲洗水注入系统中发生的故障。这些故障导致GRU在没有洗涤水的情况下运行，这意味着氰化物没有被有效地捕集或去除。使用现场检查和氢气渗透探头检测和测量氢气渗透的开始时间。通过跟踪热稳定盐的含量，还可以在胺回收单元（ARU）的下游进行状态监测。这些措施有助于及时重新启动冲洗水注入程序，并避免了将来在GRU压缩系统下游可能发生的故障。

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