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.