![]() ![]() The benefits of the new approach, while combining with the organic dispersant for hydrocarbon dispersion and amines for neutralization treatment can be summarized as follows: Any change in the feed water chemistry will lead to pH variations and cause problems. This is due to the fact that the incoming water into the system is pure and hence does not have a buffering capacity. A novel operation and chemical treatment approach has proven the present reboilers treatment program at the DSG generation system can be revised to provide a more robust treatment approach. If the reboilers are heated by quench oil, tube leaks could result in massive organic fouling on waterside from quench oil contamination. ![]() Tube leaks are the most common cause for shutdown of DSG reboilers. Corrosion can also occur in the dilution steam itself if the steam is wet, although this is not a common problem. ![]() These phenomena promote organic / inorganic fouling and can lead to under-deposit localized low pH acidic corrosion. With medium pressure steam as the heat source, DSG reboilers operating at high heat flux or high percentage of water evaporation rate with respect to circulation flow, can experience departure from nucleate boiling and formation of steam / water interface. pH and / or presence of dissolved oxygen typically cause corrosion. Corrosion is an operating challenge encountered in the DSG reboilers for a typical liquid cracker ethylene unit. The proper operation and chemical treatment program can extend this average mean failure to greater than a 400% improvement. The tube life can be at times as low as three months between average mean failures. The reliability of high heat flux reboilers can be a challenge. ![]()
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