一种新型的天然气脱蜡脱水脱烃工艺

通过对低温分离工艺中蜡堵问题的分析和研究,提出了一种新型的低温分离天然气脱蜡脱水脱烃装置及方法,即在传统低温脱水脱烃工艺的基础上,利用低温醇烃液与原料天然气中石蜡组成"相似相溶"的原理,将低温分离器底部的低温醇烃液通过泵注入到原料天然气中,改变天然气的组成,有利于石蜡在原料气分离器中的分离,降低原料气分离器分离温度,从而提高分离效率,减少醇液注入量,降低低温分离系统与醇液再生系统的能耗,降低操作费用,起到节能减排的作用,同时还能解决低温分离过程中的结蜡问题。     

Modification of Ni/SiO2 Catalysts by Means of a Novel Plasma Technology

Atmospheric high frequency cold plasma jet was applied to modify Ni/SiO2 catalysts. The catalysts prepared by two different methods with plasma jet were compared with conventional catalysts. BET, XRD, H2-TPD and high-resolution transmission electron microscopy （HRTEM） were used to characterize these catalysts. The results showed that the catalyst prepared with plasma jet had higher nickel dispersion, larger specific surface area and smaller nickel particle size, about 5 nanometres. Detailed analyses revealed that improved structure and characteristic of the plasma catalyst were benefited from the large amount of hydrogen atoms in the plasma jet, by which the catalyst reduction can be easily achieved in shorter period of time at lower temperature, thus avoiding sintering and conglomeration of the active particles and the support. The activity of catalysts was investigated in the methane reforming with CO2. It is shown that the conversions of CH4 and CO2, the yields of H2 and CO were all significantly increased for the plasma catalysts.