CO_2的三甘醇脱水分析

天然气经过脱碳处理后剩余的CO2或电厂回收的CO2中还含有饱和水,为了阻止水合物的形成,防止两相流的出现和CO2溶于水后对管道、设备的腐蚀,在管输之前需要对主体为CO2的混合气体进行脱水处理。运用Aspen HYSYS模拟TEG脱除CO2中水分的过程。在一定气体流量下,通过改变吸收塔工作压力、温度、塔板数、再生塔的重沸器温度和TEG循环量,对影响CO2脱水的因素进行了研究。结果表明,在处理酸性湿气气体流量为46.64×104 m3/d(20℃,101.325kPa)的条件下,采用吸收塔工作压力为2 000kPa,工作温度为常温,吸收塔塔板数为8~10块,再生塔重沸器温度为200℃,TEG循环流率为1.1kg/kg(脱除水量)的工艺优化参数,可使处理后的混合气体含水量满足管输要求。

Analysis of dehydration from CO2 by TEG

CO2 removed from natural gas decarburization unit or recovered from power plant still contain saturated water.In order to prevent the formation of hydrates,the emergence of two-phase flow and the corrosion of pipeline and equipment when CO2 dissolves in water,gas dehydration process is necessary before pipeline transportation.Herein Aspen HYSYS was used to simulate the dehydration process from CO2,and influence factors of CO2 dehydration were investigated.Under a certain feed rate,through changing the pressure,temperature,number of tray plate in absorber,reboiler temperature and circulation rate of TEG the computed results gave optimal process parameters.The results showed that with the feed gas rate of 466.4×10^3 m3/d,the working pressure of 2 000 kPa and room temperature for absorber,the tray number in absorber was 8-10,reboiler temperature was 200 ℃,and the circulation rate of TEG was 1.1 kg/kg（water removed）,the water content in the mixed gas could meet pipeline requirements.