天然气三甘醇脱水装置节能分析

目前，国内多数三甘醇脱水装置运行状况正常，基本能达到管输天然气水露点的要求，但现有三甘醇脱水装置普遍存在甘醇贫富液换热效果差、高压甘醇富液的压力能未得到有效利用、工艺参数不够优化等问题，导致脱水装置的能耗偏高。为了有效降低脱水装置的能耗，实现脱水装置的节能运行，本文分析了国内三甘醇脱水装置用能方面存在的主要问题，提出了甘醇脱水装置的主要节能措施，并对常规的三甘醇脱水装置工艺流程进行节能改进。在流程中应用了先进的能量转换泵和高效的板式换热器，取消了甘醇泵前水冷却器、循环水系统及泵出口缓冲装置。本文对脱水工艺的应用实例进行了工艺模拟和能耗分析，分析表明：与常规三甘醇脱水装置相比，改进后的甘醇脱水工艺节能效果显著，提高了能量综合利用率，简化了工艺流程，在工艺设计和技术改造中值得推广使用。

Analysis on Energy Saving of Natural Gas TEG Dehydration Unit

At present, most of domestic triethylene glycol(TEG) dehydration units are in normal operation, and it's processing effect can meet the gas pipeline specifications of water dew point. But problems such as lower efficiency of rich/lean glycol heat exchange, the pressure energy of high -pressure rich glycol liquid is inefficient used and process parameters are not under optimum conditions are widely existed in present TEG dehydration units, resulting in high energy consumption of dehydration units. In order to reduce the energy consumption of dehydration units and achieve energy saving operation, this paper analyses the main problems in energy consumption of domestic TEG dehydration units, and proposes major energy-saving measures. The advanced energy transfer pump and efficient plate heat exchanger are applied in the process. Meanwhile, water cooler using before glycol pump, water circulating system and pump outlet buffer devices are cancelled in this process. Through process simulation and energy saving analysis on application examples, it shows that, the improved dehydration process has significant energy saving effect and increase comprehensive utilization rate of energy and simplify the process compared to conventional TEG dehydration units.