天然气脱碳工艺改进

Natural gas decarbonization process improvement

在天然气常规脱碳工艺的基础上研究其改进工艺(一段吸收+闪蒸+汽提)再生工艺,采用活化MDEA配方溶液作为吸收剂,研究2种流程的净化效果、关键参数分析、装置运行能耗,对比2种流程,分析改进流程。结果表明,贫胺液进塔温度和原料气温度提高均不利于天然气脱碳,但在达到净化效果的前提下可以适当增加贫胺液进塔温度来降低装置运行综合能耗;同一工况条件下,一段吸收+(闪蒸+汽提)再生工艺比常规天然气脱碳工艺更节能,若汽提塔采用板式塔,塔板数建议采取5块左右。

On the basis of the conventional decarbonization process for natural gas,one-section absorption+flash+stripping regeneration process,a modified decarbonization process,is studied.The activated MDEA formula solution is used as the absorbent to study the purification effect,key parameter analysis and facility running energy consumption of two processes.The modified process is analyzed through comparing two processes.The conclusion is as follows:the increases of both the entering tower temperature of lean amine solution and the temperature of the feed gas are not conducive to the decarbonization of natural gas,but the entering tower temperature of the lean amine solution can be increased appropriately to reduce the comprehensive energy consumption of the plant operation in the premise of achieving the purification effect.Under the same conditions,one-section absorption+flash+stripping regeneration process is more energy efficient than the conventional natural gas decarburization process.If the stripper adopts a plate tower,the number of trays is recommended to be about 5 pieces.