摘要
新疆塔河油田随着注氮开采的进行,采出的伴生气中含有较多的氮气影响天然气的热值。为了脱除天然气中的氮气,基于冷油吸收原理,选用C5作为吸收剂,借助HYSYS仿真模拟软件对冷油吸收脱氮工艺关键参数敏感性分析,确定了吸收塔压力、吸收塔温度、贫液循环量、解吸压力及塔板数等参数的取值范围;基于响应面分析法探究对处理工艺的能耗水平及吸收效果,并得到该脱氮工艺的最优参数组合。结果表明:优化后,天然气中氮气物质的量分数由20%降至7.6%,甲烷回收率达到97.3%,高发热值可达35.71 MJ/m^3,满足二类天然气技术指标;相比于优化前,优化后获得产品气所需能耗为0.166 kW·h/m^3,流程比功耗降低8.3%。
The nitrogen injection exploitation in Tahe Oilfield brings excessive nitrogen into the associated gas,which affects the heat value of natural gas.In order to remove the nitrogen contained in gas product,HYSYS simulation software was used to analyze the sensitivity of several key parameters in the cold oil absorption nitrogen rejection process with C5 hydrocarbon as absorbent based on cold oil absorption principle.The ranges of absorption tower pressure and temperature,lean liquid circulation volume,desorption pressure and tray number were determined.Based on response surface methodology,the energy consumption and absorption efficiency of the process were investigated,and the optimal parameters combination of the process was obtained.The results show that after optimization,the molar fraction of nitrogen in product gas is reduced from 20%to 7.6%with a methane recovery rate of up to 97.3%,and the high calorific value of product gas reaches 35.71 MJ/m^3,which meets the technical standards of class II natural gas.The product gas specific power consumption of the optimized process is 0.166 kW·h/m^3,which is 8.3%lower than that of the unoptimized process.
作者
姚丽蓉
赵德银
崔伟
马国光
尹晨阳
YAO Li-rong;ZHAO De-yin;CUI Wei;MA Guo-guang;YIN Chen-yang(Sinopec Northwest Oilfield Company,Key Laboratory of Enhanced Recovery of Sinopec's Fracture-cave Reservoir,Urumqi 830011,China;Petroleum Engineering School of Southwest Petroleum University,Chengdu 610500,China)
出处
《天然气化工—C1化学与化工》
CAS
CSCD
北大核心
2020年第6期75-81,共7页
Natural Gas Chemical Industry
基金
中国石化科技重大专项(P18022)。
关键词
含氮天然气
脱氮
工艺优化
响应面分析法
冷油吸收
nitrogen-rich natural gas
nitrogen rejection
process optimization
response surface analysis
cold oil absorption
