基于敏感性分析的三甘醇脱水系统调节方法研究

Research on regulation method of TEG dehydration system based on sensitivity analysis

关键词:  三甘醇脱水  HYSYS  产品气中水含量  相对敏感度

Key words:  TEG dehydration  HYSYS  water content in product gas  relative sensitivity

摘要:

为了研究不同操作参数对三甘醇(TEG)系统脱水效果的影响程度,以国内某海上平台设计处理能力为5×10⁴ m³/h的TEG脱水系统为研究对象,使用HYSYS软件建立了符合现场运行状况的模型。采用单一变量法,分别模拟计算了贫TEG循环量、入口湿气温度、再沸器温度和汽提气量4个操作参数的相对敏感度参数绝对值。通过逐次调节各工况点下最敏感的操作参数,使产品气中水含量降低至目标要求。模拟结果表明,先将入口湿气温度由40 ℃降至37 ℃,再将再沸器温度由195 ℃升至196 ℃,是当前工况点降低产品气中水含量的最优方案。采用该方案进行现场调试,产品气中水质量浓度可由13.31 mg/m³降至8.44 mg/m³,调试结果与模拟结果接近。调节各工况点最敏感操作参数直至满足产品气中水含量要求的方法可为今后TEG系统的调节提供参考。 

Abstract:

In order to study the influence of different operating parameters on the dehydration effect of triethylene glycol (TEG) system, taking the TEG dehydration system with the design capacity of 5×10⁴ m³/h on a domestic offshore platform as the research object, and a model in line with the field operating condition was established by using HYSYS software. The absolute values of relative sensitivity parameters of lean TEG circulation, inlet wet gas temperature, reboiler temperature and stripping gas flow rate were simulated respectively by single variable method. By adjusting the most sensitive operating parameters at each operating point step by step, the water content of product gas was reduced below the required value. The simulation results showed that reducing the inlet wet gas temperature from 40 ℃ to 37 ℃ followed by increasing the reboiler temperature from 195 ℃ to 196 ℃ was the best approach to reduce the water content in product gas at the current operation condition. Following the adjustment steps based on the simulation results, the water mass concentration in field-test product gas could be reduced from 13.31 mg/m³ to 8.44 mg/m³. The field commissioning result is close to the simulation result. The method of adjusting the most sensitive operating parameters at each operating condition to reach the specification of water content in product gas can provide a reference for the regulation of TEG system in the future.