南山终端三甘醇脱水系统参数优化分析
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摘要
崖城天然气田开发进入后期阶段,输送到南山终端的天然气量急剧降低,由40 MMscf/d降低到5~20 MMscf/d。随着产能的变化,三甘醇脱水系统的工艺参数需要进行优化。以理论计算的方式分析了在目前生产状况下,生产合格天然气所需要的贫三甘醇纯度、三甘醇最低循环量、三甘醇重沸器的温度以及汽提气的用量,为低流量工况下三甘醇系统参数的优化工作提供详细、准确的数据参考,也可为其他三甘醇脱水装置的参数优化提供借鉴。经过理论计算及结合现场实践,最终使得贫三甘醇最低循环速率下降为之前的五分之一,重沸器工作温度可降低到25℉,汽提气的流率仅为之前的2%,每年可以节约汽提气10.3 MMscf。
The development of Yacheng Natural Gas Field has stepped into the later phase, and the amount of natural gas delivered to Nanshan terminal decreases rapidly from 40 MMscf/d to 5~20 MMscf/d.With the change of the production capacity,process parameters of triethylene glycol dehydration system need to be optimized.Using the theoretical arithmetic method,the purity of poor triethylene glycol,the minimum circulation volume of triethylene glycol,the temperature of the triethylene glycol reboiler and the volume of stripping gas needed for producing qualified natural gas in current production situation are analyzed.They can provide detailed and accurate data for system parameters of triethylene glycol under low-flow working condition and offer a reference for parameter optimization of other glycol dehydration devices. Through theoretical calculation and field practice, finally the minimum circulation rate of triethylene glycol can be reduced to 20% of original one,the working temperature of the reboiler can be reduced to 25 ℉, the flow rate of stripping gas can be reduced to 2% of the original rate,and stripping gas can be saved by 10.3 MMscf per year.
The development of Yacheng Natural Gas Field has stepped into the later phase, and the amount of natural gas delivered to Nanshan terminal decreases rapidly from 40 MMscf/d to 5~20 MMscf/d.With the change of the production capacity,process parameters of triethylene glycol dehydration system need to be optimized.Using the theoretical arithmetic method,the purity of poor triethylene glycol,the minimum circulation volume of triethylene glycol,the temperature of the triethylene glycol reboiler and the volume of stripping gas needed for producing qualified natural gas in current production situation are analyzed.They can provide detailed and accurate data for system parameters of triethylene glycol under low-flow working condition and offer a reference for parameter optimization of other glycol dehydration devices. Through theoretical calculation and field practice, finally the minimum circulation rate of triethylene glycol can be reduced to 20% of original one,the working temperature of the reboiler can be reduced to 25 ℉, the flow rate of stripping gas can be reduced to 2% of the original rate,and stripping gas can be saved by 10.3 MMscf per year.
引文
[1]李士伦.天然气工程[M].北京:石油工业出版社,2000:268-269.
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[3]CAMPBELL J M.Gas conditioning and processing[M].Volume1.USA:Campbell and Company,1984:159,162.
[4]王遇冬.天然气处理原理与工艺[M].北京:中国石化出版社,2011:9-12.
[5]郝蕴.三甘醇脱水工艺探讨[J].中国海上油气工程,2001,13(3):22-29.
[6]TWU C H,TASSONE V,SIM W D,et al.Advanced equation of state method for modeling TEG–water for glycol gas dehydration[J].Fluid Phase Equilibria,2005,228(3):213-221.
[7]曾自强,张育芳.天然气集输工程[M].北京:石油工业出版社,2001:40,274-283.
[2]CAMPBELL J M.Gas conditioning and processing[M].Volume2.USA:Campbell and Company,1984:333-349.
[3]CAMPBELL J M.Gas conditioning and processing[M].Volume1.USA:Campbell and Company,1984:159,162.
[4]王遇冬.天然气处理原理与工艺[M].北京:中国石化出版社,2011:9-12.
[5]郝蕴.三甘醇脱水工艺探讨[J].中国海上油气工程,2001,13(3):22-29.
[6]TWU C H,TASSONE V,SIM W D,et al.Advanced equation of state method for modeling TEG–water for glycol gas dehydration[J].Fluid Phase Equilibria,2005,228(3):213-221.
[7]曾自强,张育芳.天然气集输工程[M].北京:石油工业出版社,2001:40,274-283.