三甘醇脱水技术在煤制天然气中的应用及其影响因素 ()

为了降低煤制天然气(SNG)管道输送过程中析出的液态水对SNG管道的危害,提出SNG出厂前必须进行深度脱水,使其露点低于输气管道的环境温度的方案。三甘醇脱水技术因脱水效率高、脱水后露点温度低、投资小、操作简单、运行费用低等优点,被广泛应用于国内煤制天然气项目中。介绍了三甘醇脱水原理、工艺流程、主要设备和设备防腐措施,并详细分析了进吸收塔湿气温度、三甘醇质量分数、吸收塔操作压力、三甘醇循环量等对脱水效率的影响。最后,概述了三甘醇脱水撬在国内在建煤制天然气项目中的应用情况,并分析了压缩后脱水工艺与压缩前脱水工艺的优缺点。 The water precipitating from SNG would corrode the pipelines which serve to transport SNG,so SNG should be dewatered deeply until its dew point is lower than environmental temperature.The TEG dehydration technology is widely used in SNG process for high dehydration efficiency,lower dew point after dewatering,small investment and operating cost,easy operation and the like.Introduce the dehydration principle,technological process,major equipments and the anticorrosion measures,analyze the influence of wet gas temperature,mass fraction and circulating volume of TEG,operating pressure of absorption column on dehydration efficiency.Introduce the application of TEG dehydration pry in SNG projects under construction at home,the technological processes are compared before and after dehydration