超重力条件下旋转填料层中流体流动特性研究
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摘要
针对新型超重力天然气脱碳技术特点,以实际工程脱碳工艺数据为基础,构建了超重力机旋转填料层数值模型,研究了两相流体在超重力机旋转填料层中的流动特性,结果表明:在超重力条件下,改变流速、转速及进入方向对流体在旋转填料层中的运动几乎没有影响,旋转填料层中流体分布特性受海上晃荡工况影响可以忽略;流体分布的均匀性与旋转填料层内速度梯度及压降呈负相关的关系,速度梯度及压降越小,流体分布越均匀;随着时间的增加,流体在旋转填料层中逐渐均匀分布,此时的脱碳效果最好;提高旋转敏感度有利于流体在旋转填料层内的均匀分布。本文研究结果对超重力脱碳技术在海上工况条件下的应用具有指导意义。
According to the characteristics of new hypergravity natural gas decarburization technology, the numerical model of the hypergravity machine rotating packing layer was established based on the actual data of decarbonization process, and the flow characteristics of two-phase fluid in the rotating packing layer of the hypergravity machine were studied. The results show that under hypergravity conditions, the movement of the fluid in the rotating packing layer is subject to low influence from flow velocity, rotation speed and entering direction, and the fluid distribution characteristics in the rotating packing layer are almost not influenced by the sloshing conditions at sea. The uniformity of fluid distribution is negatively correlated with the velocity gradient and pressure drop in the rotating packing layer; the smaller velocity gradient and pressure drop will cause more uniform fluid distribution; as time elapses, the fluid gradually tends to even distribution in the rotating packing layer, and the best decarbonization effect can be obtained at that time; increasing the rotational sensitivity will facilitate the uniform distribution of fluid within the rotating packing layer. The research results of this paper will provide guidance for the application of hypergravity decarburization technology under offshore conditions.
According to the characteristics of new hypergravity natural gas decarburization technology, the numerical model of the hypergravity machine rotating packing layer was established based on the actual data of decarbonization process, and the flow characteristics of two-phase fluid in the rotating packing layer of the hypergravity machine were studied. The results show that under hypergravity conditions, the movement of the fluid in the rotating packing layer is subject to low influence from flow velocity, rotation speed and entering direction, and the fluid distribution characteristics in the rotating packing layer are almost not influenced by the sloshing conditions at sea. The uniformity of fluid distribution is negatively correlated with the velocity gradient and pressure drop in the rotating packing layer; the smaller velocity gradient and pressure drop will cause more uniform fluid distribution; as time elapses, the fluid gradually tends to even distribution in the rotating packing layer, and the best decarbonization effect can be obtained at that time; increasing the rotational sensitivity will facilitate the uniform distribution of fluid within the rotating packing layer. The research results of this paper will provide guidance for the application of hypergravity decarburization technology under offshore conditions.
引文
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[18] NAMVAR M,JAHANGIRIAN A.An investigation of mesh-less calculation for compressible turbulent flows[J].Computers & Fluids,2013,86:483-489.
[19] 燕为民.旋转填料床气液传质特性的研究[D].北京:北京化工大学,2000.YAN Weimin.A study on the characteristic of mass transfer in rotating packed bed[D].Beijing:Beijing University of chemical technology,2000.
[20] 曾曦.MDEA水溶液的物理化学性质[J].川化,1994(2):15-30.
[2] 顾安忠.液化天然气技术手册[M].北京:机械工业出版社,2010:112-122.GU Anzhong.Handbook of LNG technology[M].Beijing:China Machine Press,2010:112-122.
[3] 李玉星,朱建鲁,王武昌.FLNG液化工艺的关键技术[J].油气储运,2017,36(2):121-131.LI Yuxing,ZHU Jianlu,WANG Wuchang.Key FLNG liquefaction technologies[J].Oil & Gas Storage and Transportation,2017,36(2):121-131.
[4] 赵文华,杨建民,胡志强,等.大型浮式液化天然气开发系统关键技术现状及发展趋势[J].中国海上油气,2013,25(1):82-86,90.ZHAO Wenhua,YANG Jianmin,HU Zhiqiang,et al.Status of key technology and developing tendency for FLNG[J].China Offshore Oil and Gas,2013,25(1):82-86,90.
[5] 邰晓亮,陈杰,尹全森,等.半贫液脱酸工艺应用于浮式天然气液化装置中的可行性研究[J].中国海上油气,2014,26(4):96-99,105.TAI Xiaoliang,CHEN Jie,YIN Quansen,et al.The feasibility study of semi-lean solution acid gas removal process used on FLNG[J].China Offshore Oil and Gas,2014,26(4):96-99,105.
[6] 常学煜,李玉星,张盈盈,等.天然气脱酸工艺参数优化及节能研究[J].天然气化工(C1化学与化工),2017,42(3):67-72,92.CHANG Xueyu,LI Yuxing,ZHANG Yingying,et al.Optimization of process parameters and energy-saving research for natural gas deacidification process[J].Natural Gas Chemical Industry,2017,42(3):67-72,92.
[7] 陈杰,郭清,花亦怀,等.MDEA+MEA/DEA混合胺液脱碳性能实验研究[J].天然气工业,2014,34(5):137-143.CHEN Jie,GUO Qing,HUA Yihuai,et al.An experimental study of absorption and desorption of blended amine solutions MDEA+MEA/DEA for natural gas decarburization[J].Natural Gas Industry,2014,34(5):137-143.
[8] RAMSHAW C,MALLISM R H.Mass transfer apparatus and its use:EUR0002568B1[P].1979.
[9] SHORT H.New mass-transfer find is a matter of gravity[J].The Chemical Engineer,1983,2:13-14.
[10] MATIN C M M.Preliminary distillation mass transfer and pressure drop results using a pilot plant scale high gravity contacting unit[C].New Orleans:AIChE Spring National Meeting,1992.
[11] HAW J K.Mass transfer of centrifugally enhanced polymer devolatilization by using foam metal bed[D].USA:Case Western Reserve University,1995.
[12] FOWLER R,KHANS A S.VOC removal with rotary air stripper[C].New York:AIChE Annual Meeting,1987,11:15-17.
[13] 李银河.旋转填料床中流体流动的三维CFD数值模拟研究[D].北京:北京化工大学,2013.LI Yinhe.3D CFD numerical simulation of fluid flow in a rotating packed bed[D].Beijing:Beijing University of Chemical Technology,2013.
[14] 马静,王玉红,王丹梅,等.旋转填充床中反溶剂重结晶法制备超细硫酸沙丁胺醇实验研究[J].材料科学与工程学报,2004,22(1):74-77.MA Jing,WANG Yuhong,WANG Danmei,et al.Preparation of particles of ultra-fine salbutamol sulfate by anti-solvent re-crystallization in a rotating packed bed[J].Journal of Materials Science and Engineering,2004,22(1):74-77.
[15] 潘朝群,邓先和.双碱法多级雾化超重力旋转床烟气脱硫研究[J].环境污染治理技术与设备,2002,3(10):88-90.PAN Zhaoqun,DENG Xianhe.Process of dual-alkali FGD in multi-stage-spraying rotating packed bed[J].Techniques and Equipment for Environment Pollution Control,2002,3(10):88-90.
[16] 鲍铁虎.超重力旋转床流体力学和传质性能的研究[D].杭州:浙江工业大学,2002.BAO Tiehu.Study on performance of fluid dynamics and mass transfer of rotating bed in high-gravity[D].Hangzhou:Zhejiang University of Technology,2002.
[17] BUKOWSKI J,LIU Y N,BOCCELLA M S,et al.Innovations in natural gas liquefaction technology for future LNG plants and floating LNG facilities[C].Seoul:International Gas Union Research Conference,2011.
[18] NAMVAR M,JAHANGIRIAN A.An investigation of mesh-less calculation for compressible turbulent flows[J].Computers & Fluids,2013,86:483-489.
[19] 燕为民.旋转填料床气液传质特性的研究[D].北京:北京化工大学,2000.YAN Weimin.A study on the characteristic of mass transfer in rotating packed bed[D].Beijing:Beijing University of chemical technology,2000.
[20] 曾曦.MDEA水溶液的物理化学性质[J].川化,1994(2):15-30.
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