尹玉國,阮皓,吳棟,張麗,黃登高,竇勤成
(中國原子能科學研究院, 北京 102413)
不銹鋼三角螺旋高效填料在水-氫交換工藝中的性能研究
尹玉國,阮皓,吳棟,張麗,黃登高,竇勤成
(中國原子能科學研究院, 北京 102413)
對液相水-氫交換工藝中的小型高效三角螺旋填料進行脫脂除油、親水等進行了表面處理;通過總有機碳方法TOC分析,處理工藝對填料的脫油效果明顯,掃描電子顯微鏡SEM分析表明該處理工藝明顯改善了填料比表面積。在典型的水-氫交換工藝條件下,處理過后的小型高效填料與Pt-SDB催化劑分層填裝,該處理方式顯著提高了水-氫交換性能,等板高度HETP降低至13.46 cm;進一步實驗測定水-氫交換柱流體力學性能:床層持液量為0.03 m3/m3、床層壓降為 20 Pa/m,與理論計算一致。
水-氫交換;三角螺旋填料;脫脂除油;HETP
Abstract:A method of degreasing and hydrophilic surface treatment was used to treat the triangular spiral packing of the H2O-H2exchange process. Total organic carbon analysis and SEM analysis showed that the treatment process had good effect to improve the packing surface features. Under the typical conditions of H2O-H2exchange process, the layered filling of treated packing and the Pt-SDB catalyst in the column was carried out, the small high efficiency packing after treatment significantly improved the H2O-H2exchange performance, and reduced HETP to 13.46 cm;then hydrodynamic performance of H2O-H2exchange column was tested, liquid holdup was 0.03 m3/m3, pressure drop was 20 Pa/m, which was consistent with the theoretical calculation result.
Key words:H2O-H2exchange; Triangle spiral packing; Degreasing; HETP
自疏水催化劑的成功研制以來,液相催化交換(LPCE)工藝在氫同位素分離領域應用越來越廣泛。該工藝過程采用疏水催化劑,氫氣與液態水可直接進行同位素交換。液相催化交換工藝流程及設備簡單,反應溫度可在一般略高于室溫下進行,氣液兩相逆流可以實現多級反應[1-3]。
水-氫同位素交換分離系數小,分離要求高,介質清潔,通常采用表面處理后的小型高效金屬填料。常用填料類型有θ網環填料、三角螺旋填料等,該類型填料具有壓降小、氣液通量大、傳質效率高等特點。
在小型高效金屬填料的生產過程中,潤滑和防腐蝕的油脂降低了填料的傳質性能[4]。一般采用丙酮等有機溶劑脫除表面油脂,此種處理方式在工藝的放大過程與工程化應用中,處理量小、經濟性差和環境不友好等弊端顯現出來,限制了此類填料工程的應用。……