Petroleum Refinery Engineering ›› 2024, Vol. 54 ›› Issue (5): 37-40.
• PROCESS EQUIPMENT AND MACHINERY • Previous Articles Next Articles
Lin Fengtao
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蔺峰涛
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Abstract:
Salt formation corrosion at the top circulation system of FCC fractionator threatens safe production and long-term operation of the unit. The quantitative analysis method can explain the conditions of salt formation more accurately, thus helping to take more effective measures to solve or alleviate the salt formation problem. The main component of salt is NH4Cl, and the main sources include two aspects: one is vapor phase crystallization, the deposition temperature of NH4Cl can be calculated by the partial pressure of NH3 and HCl in the vapor phase, the higher the calculated deposition temperature, the greater the tendency of salt formation; another source is water phase dissolution, when there is water vapor condensation in the tower, NH3 and HCl dissolution in the gas phase can produce NH4Cl solution, the difference between the dew point temperature of water vapor in the tower and the top circulation return temperature can be used as the judgment index of salt formation tendency, the greater the temperature difference, the greater the salt formation tendency. According to the analysis results, the use of sulfur-containing wastewater at the top of the fractionator as a terminator will obviously increase the tendency of salt formation, whether from the perspective of gas phase crystallization or water phase dissolution. It should be used with caution for the unit with serious salt formation corrosion problems in the top circulation system of the fractionator.
Key words: FCC unit, fractionation column, top circulation system, salt formation, gas phase partial pressure, ammonium salt, dew point temperature, corrosion,
摘要:
催化裂化分馏塔顶循环部位结盐腐蚀,威胁装置的安全生产和长周期运行。用量化分析的方法可以更准确地说明结盐产生的条件,从而有助于采取有效措施来解决或缓解结盐问题。盐的主要成分是NH4Cl,主要来源有两个:一是气相结晶,通过气相中NH3和HCl的分压可以计算出NH4Cl的沉积温度,计算的沉积温度越高,说明结盐的倾向性越大;二是水相溶解,塔内有水蒸气凝结时,气相中NH3、HCl的溶解可以生成NH4Cl溶液,塔内水蒸气露点温度与顶循环返塔温度之差可作为结盐倾向性判定指标,温差越大,结盐的倾向性越大。从分析结果看,使用分馏塔顶含硫污水作为终止剂,无论是从气相结晶还是水相溶解来看,都会明显增加结盐的倾向性。
关键词: 催化裂化装置, 分馏塔, 顶循环系统, 结盐, 气相分压, 铵盐, 露点温度, 腐蚀
Lin Fengtao . Tendency analysis of salt formation at the top circulation system of fractionation column in FCC unit[J]. Petroleum Refinery Engineering, 2024, 54(5): 37-40.
蔺峰涛 . 催化裂化装置分馏塔顶循环系统结盐倾向分析[J]. 炼油技术与工程, 2024, 54(5): 37-40.
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https://journal01.magtechjournal.com/lyjsygc/EN/Y2024/V54/I5/37
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