高含氮天然气冷油吸收工艺参数模拟分析
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摘要
为脱除高含氮天然气中氮气,获得满足商品气指标的天然气,采用C_5作为吸收剂在低温下吸收天然气中的甲烷,利用HYSYS软件对冷油吸收工艺过程中温度、压力、溶剂循环量以及吸收塔板数进行研究分析,同时采用多指标正交模拟试验考察工艺参数对甲烷回收率、净化气氮气含量以及过程功耗等工艺指标的影响程度,并通过综合平衡法优选出较优方案。结果表明,当温度为-20℃、压力为3.5 MPa、循环量为5 000 kmol/h、塔板数为14时可达到较好的处理效果。
In order to remove nitrogen from high nitrogen-containing natural gas to meet commercial gas specifications,C_5 is used as an absorbent to absorb methane in natural gas at a low temperature,and the temperature,pressure,solvent circulation amount and the number of absorber trays of the cold oil absorption process are studied and analyzed by HYSYS software. Meanwhile,multi-index orthogonal simulation test is used to explore the influences of process parameters on the methane recovery rate,nitrogen content in purified gas and process power consumption.A better solution is selected by comprehensive balance method.The results show that the treatment effect will be better when the temperature is-20℃,the pressure is 3. 5 MPa,the circulation amount of solvent is 5 000 kmol per hour and the number of plate is 14.
In order to remove nitrogen from high nitrogen-containing natural gas to meet commercial gas specifications,C_5 is used as an absorbent to absorb methane in natural gas at a low temperature,and the temperature,pressure,solvent circulation amount and the number of absorber trays of the cold oil absorption process are studied and analyzed by HYSYS software. Meanwhile,multi-index orthogonal simulation test is used to explore the influences of process parameters on the methane recovery rate,nitrogen content in purified gas and process power consumption.A better solution is selected by comprehensive balance method.The results show that the treatment effect will be better when the temperature is-20℃,the pressure is 3. 5 MPa,the circulation amount of solvent is 5 000 kmol per hour and the number of plate is 14.
引文
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[2]刘成军,王志刚,钟建强.天然气脱氮工艺综述[J].石油规划设计,2000,(4):18-20.
[3]Rufford T E,Smart S,Watson G C Y,et al.The removal of CO2and N2from natural gas:A review of conventional and emerging process technologies[J].Journal of Petroleum Science and Engineering,2012,94/95:123-154.
[4]Kuo J C,Wang K H,Chen C.Pros and cons of different nitrogen removal unit(NRU)technology[J].Journal of Natural Gas Science and Engineering,2012,7:52-59.
[5]赵娜.低浓度煤层气提纯技术与应用的研究进展[J].广东化工,2016,(20):133-135.
[6]郭璞,李明.煤层气中CH4/N2分离工艺研究进展[J].化工进展,2008,(7):963-967.
[7]操斌.贫天然气分离净化过程模拟与优化[D].湘潭:湘潭大学,2012.
[8]黄丽平,李广学.变压吸附技术在工业上的应用与发展[J].广东化工,2011,38(3):14-15.
[9]杨西萍,刘煌,李赟.水合物法分离混合物技术研究进展[J].化工学报,2017,68(3):831-840.
[10]Mehra Y R,Wood G C,Ross M M.Noncryogenic N2-rejection process gets Hugoton field test[J].Oil and Gas Journal,1993,91:62-70.
[11]夏立先,纪丙全.相似相溶原理的几种重要应用[J].中学化学教学参考,1998,(S1):74-75.
[12]苑玉凤.多指标正交试验分析[J].湖北汽车工业学院学报,2005,19(4):53-56.
[13]滕海英,祝国强,黄平,等.正交试验设计实例分析[J].药学服务与研究,2008,(1):75-76.