空温式LNG气化器消雾的数值模拟研究
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摘要
空温式气化器结雾现象在一些LNG气化站和接收站成为严重影响安全生产的一大隐患。通过理论分析对空温式气化器的成雾现象进行分析并制定了两种消雾方案,利用计算流体力学方法对某气化站气化器正常运行时的成雾过程和两种消雾方案的效果进行了模拟研究。结果表明:(1)气化器正常运行时会在周围产生较大范围的白雾;(2)底部排气方案将减少一侧白雾,而在排风侧聚集大量白雾,消雾效果不明显;(3)顶部对流方案能够较大程度提高空气换热后的温度,从而较大程度上减少白雾生成区域,消雾效果较好。
In many LNG vaporizing and receiving stations, fogging generated from ambient air vaporizers is a big hidden trouble seriously affecting safe production. So, in this study, fogging phenomenon was analyzed, and two fog-dispersal methods were proposed.Moreover, taking ambient air vaporizers in one LNG vaporizing station as examples, we carried out numerical simulation on normal fogging process and thee two methods by means of fluid dynamics.Results show that(1) massive white fog may be generated all around if vaporizers are in good order;(2) substantial white fog may be accumulated in exhausting side even using base-bleed approach decreases fog amount in another side, resulting in unobvious fog-dispersal effect; and(3) to keep air convection at the top may greatly not only increase temperature after air heat exchange but also decrease fog-generating area in order to obtain better fog-dispersal effect.
In many LNG vaporizing and receiving stations, fogging generated from ambient air vaporizers is a big hidden trouble seriously affecting safe production. So, in this study, fogging phenomenon was analyzed, and two fog-dispersal methods were proposed.Moreover, taking ambient air vaporizers in one LNG vaporizing station as examples, we carried out numerical simulation on normal fogging process and thee two methods by means of fluid dynamics.Results show that(1) massive white fog may be generated all around if vaporizers are in good order;(2) substantial white fog may be accumulated in exhausting side even using base-bleed approach decreases fog amount in another side, resulting in unobvious fog-dispersal effect; and(3) to keep air convection at the top may greatly not only increase temperature after air heat exchange but also decrease fog-generating area in order to obtain better fog-dispersal effect.
引文
[1]梅鹏程,邓春锋,邓欣,等. LNG气化器的分类及选型设计[J].化学工程与装备,2016(5):65-70.
[2] Arnulf.A,Bricard. J,Cure. E. Transmission by Haze andFog in the Spectral Region 0.35 to 10 Microns. Journal ofthe Optical Society of America. 1957,47(6):491-498.
[3] Mary Beth Baxter, Ray Porter. Oregon LNG TerminalWater Vapor Plume Study[R]. U.S.:Oregon LNG Feasi-bility Study. 2008.
[4] CHIV International.LNG Vaporization Study Oregon LNGImport Terminal[R]. U.S.:Oregon LNG Feasibility Study.2007.
[5] Yoshiyuki Saiwai. Defogging by Walled Air Fin LNG Va-porizer. Nippon Steel Engineering CO. Ltd. Technical Re-view[J]. Journal of Nippon Steel&Sumikin Engineering.2010(1):39-46.
[6] Filippo Gavelli. Computational Fluid Dynamics Simula-tion of Fog Clouds Due to Ambient Air Vaporizers[J].Journal of Loss Prevention in the Process Industries 2010(23):773-780.
[2] Arnulf.A,Bricard. J,Cure. E. Transmission by Haze andFog in the Spectral Region 0.35 to 10 Microns. Journal ofthe Optical Society of America. 1957,47(6):491-498.
[3] Mary Beth Baxter, Ray Porter. Oregon LNG TerminalWater Vapor Plume Study[R]. U.S.:Oregon LNG Feasi-bility Study. 2008.
[4] CHIV International.LNG Vaporization Study Oregon LNGImport Terminal[R]. U.S.:Oregon LNG Feasibility Study.2007.
[5] Yoshiyuki Saiwai. Defogging by Walled Air Fin LNG Va-porizer. Nippon Steel Engineering CO. Ltd. Technical Re-view[J]. Journal of Nippon Steel&Sumikin Engineering.2010(1):39-46.
[6] Filippo Gavelli. Computational Fluid Dynamics Simula-tion of Fog Clouds Due to Ambient Air Vaporizers[J].Journal of Loss Prevention in the Process Industries 2010(23):773-780.